Display MoreI calculated average (mean) girl group sales using data compiled by @halfdavid on Twitter. Her data set includes girl groups from 2001 to present, and is up-to-date as of the March 2021 Gaon update and the April 7 2021 Oricon update. I only included groups with over 100,000 in sales.
#01. Twice: 9,204,460 ÷ 27 = 340,906
#02. Blackpink: 2,673,673 ÷ 8 = 334,209
#03. Iz*One: 2,951,524 ÷ 9 = 327,947
#04. Irene & Seulgi: 233,162 ÷ 1 = 233,162
#05. Itzy: 532,661 ÷ 3 = 177,554
#06. Girls' Generation: 5,356,042 ÷ 31 = 172,776
#07. Big Mama: 567,521 ÷ 5 = 113,504
#08. Girls' Generation-TTS: 313,903 ÷ 3 = 104,634
#09. Kara: 3,717,781 ÷ 37 = 100,481
#10. Red Velvet: 1,597,424 ÷ 16 = 99,839
#11. I.O.I: 272,000 ÷ 3 = 90,667
#12. (G)I-dle: 603,543 ÷ 7 = 86,220
#13. Loona: 307,384 ÷ 4 = 76,846
#14. f(x): 599,806 ÷ 10 = 59,981
#15. WJSN: 636,123 ÷ 11 = 57,829
#16. 2NE1: 790,987 ÷ 14 = 56,499
#17. Mamamoo: 868,826 ÷ 16 = 54,302
#18. GFriend: 983,876 ÷ 19 = 51,783
#19. fromis_9: 196,301 ÷ 5 = 39,260
#20. SeeYa: 235,393 ÷ 6 = 39,232
#21. Apink: 1,040,079 ÷ 28 = 37,146
#22. T-ara: 1,139,140 ÷ 32 = 35,598
#23. Everglow: 136,632 ÷ 4 = 34,158
#24. Wonder Girls: 374,320 ÷ 11 = 34,029
#25. Dreamcatcher: 469,626 ÷ 15 = 31,308
#26. Lovelyz: 399,873 ÷ 13 = 30,759
#27. Oh My Girl: 385,112 ÷ 15 = 25,674
#28. Weki Meki: 163,318 ÷ 7 = 23,331
#29. AOA: 419,659 ÷ 18 = 23,314
#30. Miss A: 123,990 ÷ 7 = 17,713
#31. Jewelry: 123,108 ÷ 7 = 17,587
#32. Gugudan: 103,953 ÷ 6 = 17,326
#33. Davichi: 154,838 ÷ 9 = 17,204
#34. After School: 266,233 ÷ 16 = 16,640
#35. Gavy NJ: 113,939 ÷ 7 = 16,277
#36. Rainbow: 177,717 ÷ 11 = 16,156
#37. Girl's Day: 159,214 ÷ 10 = 15,921
#38. 4Minute: 266,708 ÷ 17 = 15,689
#39. Sistar: 149,794 ÷ 11 = 13,618
#40. EXID: 159,111 ÷ 12 = 13,259
#41. DIA: 108,371 ÷ 9 = 12,041
#42. Secret: 181,319 ÷ 16 = 11,332
#43. Brown Eyed Girls: 163,881 ÷ 16 = 10,243
#44. Momoland: 121,980 ÷ 13 = 9,383
Very good post.