| Table 3. Estimated stock numbers at age. | |||||||
| Year Age | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 
| 1981 | 70154 | 61118 | 36824 | 10784 | 3292 | 933 | 716 | 
| 1982 | 52455 | 63321 | 34531 | 13537 | 4128 | 1575 | 1358 | 
| 1983 | 42816 | 37689 | 33928 | 16665 | 7349 | 3169 | 2545 | 
| 1984 | 31018 | 45233 | 29874 | 13314 | 6459 | 3432 | 3364 | 
| 1985 | 30134 | 27831 | 26602 | 11147 | 5458 | 3215 | 3203 | 
| 1986 | 24852 | 25792 | 18915 | 9387 | 2797 | 1237 | 1348 | 
| 1987 | 23876 | 23285 | 18111 | 6436 | 4457 | 1265 | 1171 | 
| 1988 | 21272 | 18272 | 18226 | 6860 | 2051 | 1613 | 795 | 
| 1989 | 19249 | 21586 | 13946 | 6108 | 1701 | 421 | 628 | 
| 1990 | 18799 | 15786 | 14832 | 5558 | 1611 | 483 | 472 | 
| 1991 | 15843 | 15517 | 13839 | 5787 | 1569 | 514 | 369 | 
| 1992 | 20957 | 11159 | 10325 | 5095 | 1465 | 459 | 282 | 
| 1993 | 28503 | 15380 | 8124 | 3565 | 1409 | 435 | 455 | 
| 1994 | 25138 | 24804 | 8599 | 3153 | 895 | 381 | 302 | 
| 1995 | 25112 | 13591 | 12878 | 5057 | 1458 | 411 | 266 | 
| 1996 | 24945 | 15713 | 10887 | 5371 | 1727 | 611 | 417 | 
| 1997 | 28008 | 20357 | 11373 | 5503 | 2014 | 611 | 496 | 
| 1998 | 30823 | 21902 | 11988 | 5280 | 2115 | 938 | 758 | 
| 1999 | 25891 | 28432 | 16191 | 5914 | 1946 | 893 | 475 | 
| 2000 | 21662 | 17737 | 13839 | 7672 | 3158 | 1128 | 896 | 
| 2001 | 14606 | 15940 | 10632 | 6411 | 3152 | 1263 | 980 | 
| 2002 | 10012 | 8812 | 7504 | 4910 | 2942 | 1694 | 1036 | 
| 2003 | 11730 | 7414 | 7015 | 3698 | 2133 | 1380 | 1275 | 
| 2004 | 15935 | 7313 | 4647 | 3243 | 1560 | 1179 | 1391 | 
| 2005 | 17839 | 11176 | 4171 | 2658 | 1497 | 839 | 898 | 
| 2006 | 14044 | 14751 | 7556 | 2425 | 1165 | 737 | 900 | 
| 2007 | 10860 | 8266 | 8077 | 3655 | 1251 | 537 | 508 | 
| 2008 | 11993 | 7308 | 5045 | 3482 | 1362 | 667 | 484 | 
| 2009 | 11278 | 8309 | 4102 | 2495 | 1988 | 812 | 507 | 
| 2010 | 13393 | 6898 | 4217 | 2381 | 1514 | 1026 | 698 | 
| 2011 | 9365 | 7878 | 4157 | 2474 | 1386 | 1110 | 942 | 
| 2012 | 7246 | 6124 | 4884 | 2714 | 1665 | 927 | 1125 | 
| 2013 | 5048 | 5009 | 3388 | 3032 | 1533 | 1164 | 1166 | 
| 2014 | 10405 | 2162 | 2389 | 1634 | 1334 | 1209 | 1418 | 
| 2015 | 13894 | 8567 | 1715 | 1157 | 862 | 669 | 1318 | 
| 2016 | 20896 | 10127 | 4819 | 1016 | 813 | 546 | 1512 |