Corpus | 1975 | 1995 | 2015 | Overall |
AL | 42,825 | 54,001 | 82,701 | 179,527 |
S | 50,877 | 65,637 | 61,443 | 177,957 |
BMB | 44,012 | 65,317 | 58,520 | 167,849 |
EE | 69,230 | 79,146 | 93,338 | 241,714 |
Total | 206,944 | 264,101 | 296,002 | 767,047 |