Surely we were 68 days in: 31 in Jan, 28 in Feb, 9 in March.

That's why we see 2020 first only in 69th place:

  68  2021-01-01  29,279  |  68  2021-01-01  21,429  |  68  2021-01-01  23,880  |  68  2021-01-01  36,510  |  68  2021-01-01  2,997,708
  69  2020-12-31  28,819  |  69  2020-12-31  21,084  |  69  2020-12-31  23,477  |  69  2020-12-31  36,478  |  69  2020-12-31  2,950,316