Revised 2011/01/26
| 年度 | 1～20名 | 21～50名 | 51～100名 | 101～200名 | 201～300名 | 301～500名 | 501名～ |
|---|---|---|---|---|---|---|---|
| 1990 | 1,314 | 2,369 | 1,618 | 888 | 276 | 196 | 88 |
| 1991 | 1,304 | 2,419 | 1,575 | 907 | 288 | 170 | 82 |
| 1992 | 1,320 | 2,540 | 2,540 | 859 | 239 | 163 | 79 |
| 1993 | 1,401 | 2,541 | 1,630 | 875 | 266 | 178 | 80 |
| 1994 | 1,439 | 2,649 | 1,514 | 881 | 327 | 152 | 63 |
| 1995 | 1,621 | 3,241 | 1,364 | 958 | 301 | 171 | 51 |
| 1996 | 2,126 | 3,497 | 1,271 | 919 | 326 | 195 | 44 |
| 1997 | 2,087 | 3,523 | 1,284 | 885 | 273 | 180 | 54 |
| 1998 | 2,056 | 3,542 | 1,240 | 918 | 259 | 190 | 54 |
| 1999 | 1,964 | 3,639 | 1,192 | 864 | 304 | 188 | 54 |
| 2000 | 2,156 | 3,698 | 1,248 | 857 | 307 | 195 | 57 |
| 2001 | 2,189 | 3,794 | 1,262 | 920 | 290 | 190 | 54 |
| 2002 | 2,236 | 3,767 | 1,334 | 972 | 304 | 165 | 68 |
| 2003 | 2,071 | 3,502 | 961 | 735 | 248 | 157 | 53 |
| 2004 | 2,324 | 3,599 | 1,112 | 937 | 251 | 190 | 52 |
| 2005 | 3,367 | 4,345 | 1,541 | 1,110 | 364 | 257 | 48 |
| 2006 | 3,796 | 4,291 | 1,511 | 1,212 | 355 | 210 | 22 |
| 2007 | 4,362 | 4,270 | 1,445 | 1,012 | 338 | 148 | 29 |
