To count valid votes, I counted the number of posts indicated on pages like this:
http://ast2012.saimoe.me/dat/coderesz0730.txt
1-1 --- 471
1-2 --- 494
1-3 --- 566
1-4 --- 500
1-5 --- 595
1-6 --- 615
1-7 --- 559
1-8 --- 670
1-9 --- 791
1-10 --- 644
1-11 --- 730
1-12 --- 692
1-13 --- 632
1-14 --- 714
1-15 --- 619
1-16 --- 721
2-1 --- 647
2-2 --- 591
2-3 --- 538
2-4 --- 555
2-5 --- 494
2-6 --- 601