I was curious about rating inflation, so I generated a json object containing counts and percentiles and some plots of codeforces rating distribution over months, only counting active contestants:
Json object
{
"2015-01-01": {
"Active": {
"count": 21827,
"percentile": 0.0
},
"Expert+": {
"count": 6763,
"percentile": 69.01543959316443
},
"CM+": {
"count": 1778,
"percentile": 91.85412562422688
},
"M+": {
"count": 724,
"percentile": 96.68300728455583
},
"IM+": {
"count": 236,
"percentile": 98.91877033032483
},
"GM+": {
"count": 124,
"percentile": 99.43189627525541
},
"IGM+": {
"count": 21,
"percentile": 99.90378888532551
},
"LGM": {
"count": 2,
"percentile": 99.99083703669767
}
},
"2015-02-01": {
"Active": {
"count": 21911,
"percentile": 0.0
},
"Expert+": {
"count": 6799,
"percentile": 68.96992378257497
},
"CM+": {
"count": 1682,
"percentile": 92.32349048423167
},
"M+": {
"count": 701,
"percentile": 96.80069371548537
},
"IM+": {
"count": 243,
"percentile": 98.89096800693716
},
"GM+": {
"count": 135,
"percentile": 99.38387111496509
},
"IGM+": {
"count": 24,
"percentile": 99.89046597599379
},
"LGM": {
"count": 1,
"percentile": 99.99543608233307
}
},
"2015-03-01": {
"Active": {
"count": 22980,
"percentile": 0.0
},
"Expert+": {
"count": 6987,
"percentile": 69.59530026109661
},
"CM+": {
"count": 1772,
"percentile": 92.28894691035683
},
"M+": {
"count": 732,
"percentile": 96.81462140992167
},
"IM+": {
"count": 268,
"percentile": 98.8337684943429
},
"GM+": {
"count": 136,
"percentile": 99.40818102697999
},
"IGM+": {
"count": 23,
"percentile": 99.89991296779809
},
"LGM": {
"count": 1,
"percentile": 99.99564838990426
}
},
"2015-04-01": {
"Active": {
"count": 22144,
"percentile": 0.0
},
"Expert+": {
"count": 6834,
"percentile": 69.13836705202313
},
"CM+": {
"count": 1770,
"percentile": 92.0068641618497
},
"M+": {
"count": 770,
"percentile": 96.52276011560694
},
"IM+": {
"count": 280,
"percentile": 98.73554913294798
},
"GM+": {
"count": 153,
"percentile": 99.30906791907515
},
"IGM+": {
"count": 33,
"percentile": 99.85097543352602
},
"LGM": {
"count": 2,
"percentile": 99.99096820809248
}
},
"2015-05-01": {
"Active": {
"count": 21403,
"percentile": 0.0
},
"Expert+": {
"count": 6496,
"percentile": 69.64911461010139
},
"CM+": {
"count": 1803,
"percentile": 91.57594729710789
},
"M+": {
"count": 781,
"percentile": 96.35097883474279
},
"IM+": {
"count": 291,
"percentile": 98.64037751717049
},
"GM+": {
"count": 172,
"percentile": 99.1963743400458
},
"IGM+": {
"count": 34,
"percentile": 99.84114376489278
},
"LGM": {
"count": 1,
"percentile": 99.99532775779096
}
},
"2015-06-01": {
"Active": {
"count": 22377,
"percentile": 0.0
},
"Expert+": {
"count": 6768,
"percentile": 69.75465880144792
},
"CM+": {
"count": 1821,
"percentile": 91.86217991687894
},
"M+": {
"count": 783,
"percentile": 96.50087143048665
},
"IM+": {
"count": 310,
"percentile": 98.61464896992447
},
"GM+": {
"count": 181,
"percentile": 99.19113375340751
},
"IGM+": {
"count": 42,
"percentile": 99.81230727979622
},
"LGM": {
"count": 2,
"percentile": 99.99106225141887
}
},
"2015-07-01": {
"Active": {
"count": 23683,
"percentile": 0.0
},
"Expert+": {
"count": 7224,
"percentile": 69.49710762994553
},
"CM+": {
"count": 1934,
"percentile": 91.83380483891399
},
"M+": {
"count": 844,
"percentile": 96.43626229785077
},
"IM+": {
"count": 353,
"percentile": 98.50947937339019
},
"GM+": {
"count": 201,
"percentile": 99.15128995481992
},
"IGM+": {
"count": 49,
"percentile": 99.79310053624963
},
"LGM": {
"count": 2,
"percentile": 99.99155512392856
}
},
"2015-08-01": {
"Active": {
"count": 22990,
"percentile": 0.0
},
"Expert+": {
"count": 7007,
"percentile": 69.52153110047847
},
"CM+": {
"count": 1834,
"percentile": 92.02261852979557
},
"M+": {
"count": 819,
"percentile": 96.43758155719878
},
"IM+": {
"count": 348,
"percentile": 98.48629839060462
},
"GM+": {
"count": 186,
"percentile": 99.19095258808177
},
"IGM+": {
"count": 51,
"percentile": 99.77816441931274
},
"LGM": {
"count": 2,
"percentile": 99.99130056546325
}
},
"2015-09-01": {
"Active": {
"count": 22530,
"percentile": 0.0
},
"Expert+": {
"count": 6816,
"percentile": 69.74700399467376
},
"CM+": {
"count": 1792,
"percentile": 92.04616067465601
},
"M+": {
"count": 809,
"percentile": 96.4092321349312
},
"IM+": {
"count": 334,
"percentile": 98.51753217931646
},
"GM+": {
"count": 183,
"percentile": 99.18774966711052
},
"IGM+": {
"count": 50,
"percentile": 99.7780736795384
},
"LGM": {
"count": 2,
"percentile": 99.99112294718154
}
},
"2015-10-01": {
"Active": {
"count": 23223,
"percentile": 0.0
},
"Expert+": {
"count": 6944,
"percentile": 70.098609137493
},
"CM+": {
"count": 1824,
"percentile": 92.14571760754424
},
"M+": {
"count": 821,
"percentile": 96.46471170822029
},
"IM+": {
"count": 346,
"percentile": 98.51009774792232
},
"GM+": {
"count": 183,
"percentile": 99.2119881152306
},
"IGM+": {
"count": 50,
"percentile": 99.78469620634715
},
"LGM": {
"count": 2,
"percentile": 99.99138784825388
}
},
"2015-11-01": {
"Active": {
"count": 23943,
"percentile": 0.0
},
"Expert+": {
"count": 6509,
"percentile": 72.8146013448607
},
"CM+": {
"count": 1804,
"percentile": 92.46543875036545
},
"M+": {
"count": 780,
"percentile": 96.74226287432653
},
"IM+": {
"count": 333,
"percentile": 98.60919684250094
},
"GM+": {
"count": 187,
"percentile": 99.21897840705007
},
"IGM+": {
"count": 56,
"percentile": 99.76611118072088
},
"LGM": {
"count": 2,
"percentile": 99.99164682788289
}
},
"2015-12-01": {
"Active": {
"count": 24664,
"percentile": 0.0
},
"Expert+": {
"count": 6456,
"percentile": 73.82419721050924
},
"CM+": {
"count": 1939,
"percentile": 92.13833927992215
},
"M+": {
"count": 739,
"percentile": 97.00373013298734
},
"IM+": {
"count": 318,
"percentile": 98.71067142393773
},
"GM+": {
"count": 188,
"percentile": 99.23775543301979
},
"IGM+": {
"count": 54,
"percentile": 99.78105741161207
},
"LGM": {
"count": 2,
"percentile": 99.99189101524489
}
},
"2016-01-01": {
"Active": {
"count": 24013,
"percentile": 0.0
},
"Expert+": {
"count": 5985,
"percentile": 75.07600049972932
},
"CM+": {
"count": 1854,
"percentile": 92.27918210969058
},
"M+": {
"count": 681,
"percentile": 97.16403614708699
},
"IM+": {
"count": 284,
"percentile": 98.81730729188357
},
"GM+": {
"count": 175,
"percentile": 99.27122808478741
},
"IGM+": {
"count": 61,
"percentile": 99.74597093241161
},
"LGM": {
"count": 4,
"percentile": 99.98334235622372
}
},
"2016-02-01": {
"Active": {
"count": 25379,
"percentile": 0.0
},
"Expert+": {
"count": 6167,
"percentile": 75.70038220576066
},
"CM+": {
"count": 1985,
"percentile": 92.17857283580913
},
"M+": {
"count": 678,
"percentile": 97.32849994089602
},
"IM+": {
"count": 295,
"percentile": 98.83762165569959
},
"GM+": {
"count": 181,
"percentile": 99.28681193112416
},
"IGM+": {
"count": 64,
"percentile": 99.74782300327043
},
"LGM": {
"count": 6,
"percentile": 99.9763584065566
}
},
"2016-03-01": {
"Active": {
"count": 24874,
"percentile": 0.0
},
"Expert+": {
"count": 5980,
"percentile": 75.95883251588003
},
"CM+": {
"count": 2028,
"percentile": 91.84690841842888
},
"M+": {
"count": 681,
"percentile": 97.26220149553751
},
"IM+": {
"count": 287,
"percentile": 98.84618477124708
},
"GM+": {
"count": 181,
"percentile": 99.27233255608266
},
"IGM+": {
"count": 72,
"percentile": 99.7105411272815
},
"LGM": {
"count": 4,
"percentile": 99.98391895151563
}
},
"2016-04-01": {
"Active": {
"count": 25851,
"percentile": 0.0
},
"Expert+": {
"count": 6089,
"percentile": 76.44578546284477
},
"CM+": {
"count": 2138,
"percentile": 91.72952690418165
},
"M+": {
"count": 748,
"percentile": 97.10649491315617
},
"IM+": {
"count": 326,
"percentile": 98.73892692739159
},
"GM+": {
"count": 203,
"percentile": 99.21473057135121
},
"IGM+": {
"count": 71,
"percentile": 99.72534911608835
},
"LGM": {
"count": 6,
"percentile": 99.97679006614831
}
},
"2016-05-01": {
"Active": {
"count": 23397,
"percentile": 0.0
},
"Expert+": {
"count": 5519,
"percentile": 76.41150574860025
},
"CM+": {
"count": 1979,
"percentile": 91.54165063897081
},
"M+": {
"count": 717,
"percentile": 96.93550455186562
},
"IM+": {
"count": 319,
"percentile": 98.63657733897509
},
"GM+": {
"count": 206,
"percentile": 99.11954524084284
},
"IGM+": {
"count": 75,
"percentile": 99.67944608283113
},
"LGM": {
"count": 5,
"percentile": 99.9786297388554
}
},
"2016-06-01": {
"Active": {
"count": 23271,
"percentile": 0.0
},
"Expert+": {
"count": 5531,
"percentile": 76.23222036010485
},
"CM+": {
"count": 2111,
"percentile": 90.92862360878347
},
"M+": {
"count": 722,
"percentile": 96.89742598083451
},
"IM+": {
"count": 310,
"percentile": 98.66786988096773
},
"GM+": {
"count": 205,
"percentile": 99.11907524386575
},
"IGM+": {
"count": 77,
"percentile": 99.66911606720811
},
"LGM": {
"count": 7,
"percentile": 99.96991964247347
}
},
"2016-07-01": {
"Active": {
"count": 24808,
"percentile": 0.0
},
"Expert+": {
"count": 5832,
"percentile": 76.49145436955821
},
"CM+": {
"count": 2159,
"percentile": 91.29716220574008
},
"M+": {
"count": 752,
"percentile": 96.96871976781684
},
"IM+": {
"count": 330,
"percentile": 98.6697839406643
},
"GM+": {
"count": 217,
"percentile": 99.12528216704288
},
"IGM+": {
"count": 82,
"percentile": 99.66946146404386
},
"LGM": {
"count": 8,
"percentile": 99.9677523379555
}
},
"2016-08-01": {
"Active": {
"count": 24501,
"percentile": 0.0
},
"Expert+": {
"count": 5718,
"percentile": 76.6621770539978
},
"CM+": {
"count": 2163,
"percentile": 91.17178890657524
},
"M+": {
"count": 748,
"percentile": 96.94706338516795
},
"IM+": {
"count": 323,
"percentile": 98.68168646177708
},
"GM+": {
"count": 216,
"percentile": 99.11840333047631
},
"IGM+": {
"count": 87,
"percentile": 99.64491245255296
},
"LGM": {
"count": 5,
"percentile": 99.97959266968695
}
},
"2016-09-01": {
"Active": {
"count": 25680,
"percentile": 0.0
},
"Expert+": {
"count": 5870,
"percentile": 77.14174454828661
},
"CM+": {
"count": 2241,
"percentile": 91.2733644859813
},
"M+": {
"count": 735,
"percentile": 97.13785046728972
},
"IM+": {
"count": 312,
"percentile": 98.78504672897196
},
"GM+": {
"count": 212,
"percentile": 99.17445482866043
},
"IGM+": {
"count": 77,
"percentile": 99.70015576323988
},
"LGM": {
"count": 7,
"percentile": 99.97274143302181
}
},
"2016-10-01": {
"Active": {
"count": 25659,
"percentile": 0.0
},
"Expert+": {
"count": 5850,
"percentile": 77.20098211153982
},
"CM+": {
"count": 2245,
"percentile": 91.25063330605246
},
"M+": {
"count": 706,
"percentile": 97.2485287813243
},
"IM+": {
"count": 294,
"percentile": 98.8542032035543
},
"GM+": {
"count": 192,
"percentile": 99.25172454109669
},
"IGM+": {
"count": 84,
"percentile": 99.6726294867298
},
"LGM": {
"count": 7,
"percentile": 99.97271912389415
}
},
"2016-11-01": {
"Active": {
"count": 29332,
"percentile": 0.0
},
"Expert+": {
"count": 6334,
"percentile": 78.40583662893768
},
"CM+": {
"count": 2456,
"percentile": 91.62689213146052
},
"M+": {
"count": 794,
"percentile": 97.29305877539888
},
"IM+": {
"count": 311,
"percentile": 98.93972453293331
},
"GM+": {
"count": 207,
"percentile": 99.29428610391382
},
"IGM+": {
"count": 84,
"percentile": 99.71362334651575
},
"LGM": {
"count": 9,
"percentile": 99.96931678712669
}
},
"2016-12-01": {
"Active": {
"count": 30017,
"percentile": 0.0
},
"Expert+": {
"count": 6388,
"percentile": 78.71872605523536
},
"CM+": {
"count": 2458,
"percentile": 91.81130692607522
},
"M+": {
"count": 792,
"percentile": 97.36149515274678
},
"IM+": {
"count": 326,
"percentile": 98.913948762368
},
"GM+": {
"count": 213,
"percentile": 99.29040210547356
},
"IGM+": {
"count": 77,
"percentile": 99.74347869540594
},
"LGM": {
"count": 11,
"percentile": 99.9633540993437
}
},
"2017-01-01": {
"Active": {
"count": 31613,
"percentile": 0.0
},
"Expert+": {
"count": 6742,
"percentile": 78.67333059184513
},
"CM+": {
"count": 2607,
"percentile": 91.75339259165533
},
"M+": {
"count": 839,
"percentile": 97.34602853256571
},
"IM+": {
"count": 335,
"percentile": 98.9403093663999
},
"GM+": {
"count": 230,
"percentile": 99.27245120678202
},
"IGM+": {
"count": 84,
"percentile": 99.73428652769431
},
"LGM": {
"count": 8,
"percentile": 99.97469395501851
}
},
"2017-02-01": {
"Active": {
"count": 32078,
"percentile": 0.0
},
"Expert+": {
"count": 6755,
"percentile": 78.94195398715631
},
"CM+": {
"count": 2597,
"percentile": 91.90410873495854
},
"M+": {
"count": 847,
"percentile": 97.35956106989214
},
"IM+": {
"count": 341,
"percentile": 98.93696614502151
},
"GM+": {
"count": 235,
"percentile": 99.26741068645177
},
"IGM+": {
"count": 90,
"percentile": 99.7194338799177
},
"LGM": {
"count": 10,
"percentile": 99.96882598665752
}
},
"2017-03-01": {
"Active": {
"count": 32786,
"percentile": 0.0
},
"Expert+": {
"count": 6870,
"percentile": 79.04593424022448
},
"CM+": {
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"percentile": 91.80137863722321
},
"M+": {
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"percentile": 97.2366253888855
},
"IM+": {
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"percentile": 98.86536936497285
},
"GM+": {
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"percentile": 99.2618800707619
},
"IGM+": {
"count": 93,
"percentile": 99.71634234124322
},
"LGM": {
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"percentile": 99.97254925882999
}
},
"2017-04-01": {
"Active": {
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"percentile": 0.0
},
"Expert+": {
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"percentile": 79.02017798925016
},
"CM+": {
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},
"M+": {
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},
"IM+": {
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},
"GM+": {
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},
"IGM+": {
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},
"LGM": {
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}
},
"2017-05-01": {
"Active": {
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"percentile": 0.0
},
"Expert+": {
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"percentile": 78.77687620370662
},
"CM+": {
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},
"M+": {
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},
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"percentile": 98.756038266031
},
"GM+": {
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},
"IGM+": {
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"percentile": 99.68427367158148
},
"LGM": {
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"percentile": 99.95895557730559
}
},
"2017-06-01": {
"Active": {
"count": 31438,
"percentile": 0.0
},
"Expert+": {
"count": 6834,
"percentile": 78.26197595266875
},
"CM+": {
"count": 2692,
"percentile": 91.43711432024938
},
"M+": {
"count": 956,
"percentile": 96.95909408995483
},
"IM+": {
"count": 407,
"percentile": 98.70538838348496
},
"GM+": {
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"percentile": 99.16343278834532
},
"IGM+": {
"count": 106,
"percentile": 99.66282842420001
},
"LGM": {
"count": 13,
"percentile": 99.95864876900566
}
},
"2017-07-01": {
"Active": {
"count": 30097,
"percentile": 0.0
},
"Expert+": {
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"percentile": 77.56919294281822
},
"CM+": {
"count": 2706,
"percentile": 91.0090706714955
},
"M+": {
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},
"IM+": {
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},
"GM+": {
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},
"IGM+": {
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"percentile": 99.64116024852976
},
"LGM": {
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"percentile": 99.95348373592053
}
},
"2017-08-01": {
"Active": {
"count": 30553,
"percentile": 0.0
},
"Expert+": {
"count": 6711,
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"2020-07-01": {
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"2020-08-01": {
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}
}
Plot for Experts:
Spoiler
Codes and files are available here.
How has Expert changed? That might actually be the most interesting part.
Added.
can you add the plot of experts as well please?
Added.
Auto comment: topic has been updated by ShafinKhadem (previous revision, new revision, compare).
Sadly the drive folder is a broken link now. If you could upload them again, or maybe even better, put them in a github repo that would be great.
I would love to make a little web app to refresh these stats and make them update weekly or something, so we don't have to wait for another person posting rating distributions once in a while.