Guess my previous suggestion is out.
Looking at the digit frequencies, combined with 0 always following 1, I can't shake off the sense that this has something to do with two-digit numbers, with lots in the 10's (and maybe 20's)
1 - 66
2 - 20
5 - 17
4 - 15
0 - 13
3 - 7
7 - 6
9 - 6
6 - 2
8 - 2