| Table 2. Estimated stock numbers. | ||||||||||
| Year\Age | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11+ | 
| 1980 | 23086 | 27364 | 42193 | 28653 | 9040 | 7766 | 2561 | 898 | 403 | 261 | 
| 1981 | 26082 | 18888 | 22404 | 32112 | 19479 | 5219 | 4175 | 1084 | 372 | 117 | 
| 1982 | 34064 | 21335 | 15447 | 17077 | 22720 | 11329 | 2810 | 1899 | 450 | 115 | 
| 1983 | 55381 | 27834 | 17445 | 11657 | 11861 | 13937 | 5883 | 1257 | 839 | 143 | 
| 1984 | 39975 | 45707 | 22743 | 12984 | 8379 | 7365 | 7928 | 2734 | 608 | 345 | 
| 1985 | 82290 | 32403 | 37684 | 17953 | 9340 | 5300 | 4172 | 3953 | 1379 | 239 | 
| 1986 | 118302 | 67643 | 26476 | 28311 | 12744 | 5891 | 3058 | 2146 | 2188 | 588 | 
| 1987 | 62318 | 97538 | 55715 | 20341 | 19396 | 7973 | 3382 | 1555 | 1136 | 953 | 
| 1988 | 37835 | 50919 | 80098 | 41564 | 13608 | 11275 | 4394 | 1658 | 756 | 489 | 
| 1989 | 26716 | 30946 | 42150 | 61267 | 27945 | 7939 | 6152 | 2161 | 787 | 338 | 
| 1990 | 33827 | 21664 | 25160 | 31508 | 42404 | 16482 | 4395 | 3050 | 1042 | 351 | 
| 1991 | 18609 | 27889 | 17534 | 18740 | 20829 | 25540 | 8789 | 2168 | 1469 | 467 | 
| 1992 | 25286 | 15092 | 23017 | 13195 | 12139 | 11746 | 13582 | 4267 | 1021 | 625 | 
| 1993 | 21925 | 20798 | 12237 | 16667 | 8352 | 6680 | 6057 | 6882 | 2026 | 457 | 
| 1994 | 34372 | 17776 | 16853 | 8805 | 10515 | 4605 | 3351 | 2880 | 3197 | 890 | 
| 1995 | 29378 | 28226 | 14445 | 11611 | 5515 | 5818 | 2300 | 1520 | 1270 | 1346 | 
| 1996 | 20317 | 24053 | 23156 | 10138 | 7160 | 3095 | 2923 | 1057 | 683 | 566 | 
| 1997 | 11844 | 16662 | 19839 | 16508 | 6543 | 4121 | 1662 | 1377 | 503 | 325 | 
| 1998 | 32663 | 9532 | 13672 | 14046 | 10933 | 3947 | 2242 | 841 | 676 | 262 | 
| 1999 | 36571 | 27011 | 7616 | 9917 | 9447 | 6994 | 2233 | 1163 | 429 | 347 | 
| 2000 | 62755 | 29762 | 22203 | 5398 | 6747 | 5917 | 4168 | 1198 | 619 | 234 | 
| 2001 | 74087 | 51586 | 24197 | 16100 | 3559 | 4265 | 3460 | 2279 | 650 | 347 | 
| 2002 | 77653 | 60658 | 42531 | 17334 | 11008 | 2238 | 2581 | 1942 | 1250 | 371 | 
| 2003 | 33490 | 64023 | 49811 | 31039 | 11409 | 6868 | 1343 | 1488 | 1080 | 717 | 
| 2004 | 78276 | 27065 | 52418 | 36171 | 20827 | 7009 | 4112 | 801 | 850 | 619 | 
| 2005 | 48098 | 64796 | 21910 | 36352 | 23885 | 12809 | 4180 | 2429 | 467 | 487 | 
| 2006 | 22007 | 39498 | 53584 | 14860 | 23017 | 14405 | 7610 | 2481 | 1399 | 266 | 
| 2007 | 31761 | 17828 | 32468 | 35882 | 9340 | 13415 | 8428 | 4509 | 1431 | 749 | 
| 2008 | 46305 | 26056 | 14558 | 21440 | 22449 | 5671 | 7989 | 5089 | 2688 | 793 | 
| 2009 | 47287 | 38139 | 21337 | 9268 | 13086 | 13405 | 3506 | 4770 | 3000 | 1483 | 
| 2010 | 58047 | 38716 | 31414 | 13713 | 5665 | 8099 | 8264 | 2194 | 2810 | 1660 | 
| 2011 | 50514 | 47810 | 31793 | 20725 | 8504 | 3582 | 5168 | 5211 | 1349 | 1586 | 
| 2012 | 34510 | 41523 | 39340 | 21560 | 13227 | 5421 | 2315 | 3322 | 3186 | 787 | 
| 2013 | 16534 | 28481 | 34201 | 26984 | 13938 | 8495 | 3511 | 1492 | 2009 | 1776 | 
| 2014 | 12980 | 13475 | 23365 | 23202 | 17137 | 8915 | 5500 | 2256 | 901 | 1130 |