| Table 3. Estimated stock numbers at age. | ||||||||
| Year Age | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 
| 1985 | 165487 | 29843 | 19786 | 20646 | 4082 | 1107 | 359 | 205 | 
| 1986 | 59034 | 78097 | 17347 | 7711 | 4454 | 803 | 281 | 135 | 
| 1987 | 27400 | 26196 | 53235 | 6937 | 1819 | 921 | 203 | 107 | 
| 1988 | 30842 | 11803 | 17296 | 20223 | 1861 | 439 | 250 | 92 | 
| 1989 | 46972 | 13660 | 6671 | 7537 | 4950 | 487 | 128 | 94 | 
| 1990 | 76619 | 21037 | 9253 | 3114 | 2175 | 1283 | 155 | 71 | 
| 1991 | 141590 | 34223 | 14841 | 3952 | 777 | 493 | 344 | 72 | 
| 1992 | 61001 | 68186 | 22909 | 5852 | 926 | 145 | 117 | 100 | 
| 1993 | 128477 | 25415 | 46654 | 10018 | 1375 | 184 | 23 | 48 | 
| 1994 | 191887 | 58681 | 17390 | 24306 | 3323 | 272 | 32 | 16 | 
| 1995 | 66787 | 92410 | 44464 | 8264 | 8436 | 1108 | 78 | 9 | 
| 1996 | 174412 | 27265 | 76829 | 22654 | 2049 | 2330 | 249 | 12 | 
| 1997 | 257828 | 80520 | 12013 | 40730 | 5165 | 578 | 539 | 81 | 
| 1998 | 94728 | 123786 | 52840 | 5677 | 9557 | 1217 | 164 | 148 | 
| 1999 | 87964 | 40726 | 82731 | 23888 | 1729 | 2049 | 314 | 95 | 
| 2000 | 52115 | 41464 | 26798 | 33780 | 5760 | 349 | 432 | 84 | 
| 2001 | 93118 | 24744 | 30282 | 10532 | 7812 | 1392 | 82 | 118 | 
| 2002 | 29619 | 45608 | 18796 | 12945 | 2272 | 1543 | 359 | 36 | 
| 2003 | 116903 | 13837 | 38718 | 7876 | 2718 | 506 | 344 | 95 | 
| 2004 | 45345 | 60268 | 10577 | 18998 | 2252 | 589 | 151 | 117 | 
| 2005 | 44332 | 20330 | 50706 | 4918 | 5336 | 573 | 136 | 69 | 
| 2006 | 16934 | 22250 | 14180 | 24926 | 1711 | 1348 | 145 | 41 | 
| 2007 | 7752 | 7614 | 15754 | 7275 | 7642 | 719 | 427 | 56 | 
| 2008 | 60200 | 3474 | 5922 | 6959 | 2674 | 1784 | 276 | 162 | 
| 2009 | 23436 | 27890 | 4089 | 4050 | 2258 | 836 | 392 | 121 | 
| 2010 | 35653 | 10174 | 22758 | 2786 | 1578 | 651 | 213 | 112 | 
| 2011 | 27398 | 15171 | 7101 | 12969 | 1362 | 489 | 131 | 70 | 
| 2012 | 63208 | 11719 | 10690 | 4307 | 4659 | 665 | 138 | 38 | 
| 2013 | 36413 | 28164 | 8197 | 6026 | 1655 | 1345 | 238 | 61 | 
| 2014 | 22932 | 15694 | 19821 | 4247 | 2099 | 377 | 300 | 59 | 
| 2015 | 5807 | 9680 | 10283 | 9624 | 1434 | 523 | 86 | 94 | 
| 2016 | 70443 | 2237 | 6689 | 4220 | 3037 | 395 | 118 | 47 | 
| 2017 | 3185 | 32042 | 1569 | 3489 | 1335 | 641 | 89 | 40 | 
| 2018 | 7080 | 1294 | 20340 | 734 | 1210 | 299 | 123 | 29 | 
| 2019 | 19299 | 2945 | 748 | 11900 | 323 | 274 | 53 | 27 | 
| 2020 | 34367 | 8494 | 1994 | 394 | 4933 | 91 | 41 | 11 | 
| 2021 | 34367 | 16604 | 6022 | 1308 | 169 | 1599 | 20 | 12 |