| Table 3. Estimated stock numbers at age. | ||||||||
| Year Age | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| 1985 | 166208 | 29009 | 19624 | 20843 | 4138 | 1131 | 357 | 200 |
| 1986 | 58521 | 78631 | 16913 | 7580 | 4433 | 814 | 274 | 127 |
| 1987 | 26547 | 25969 | 53918 | 6750 | 1800 | 932 | 199 | 101 |
| 1988 | 31090 | 11383 | 17141 | 20205 | 1854 | 455 | 249 | 90 |
| 1989 | 47582 | 13787 | 6453 | 7443 | 4940 | 503 | 130 | 92 |
| 1990 | 74883 | 21350 | 9347 | 3139 | 2210 | 1338 | 160 | 73 |
| 1991 | 136717 | 33402 | 15070 | 4004 | 807 | 500 | 352 | 74 |
| 1992 | 61800 | 65814 | 22306 | 5857 | 951 | 155 | 117 | 101 |
| 1993 | 130965 | 25729 | 45193 | 9558 | 1401 | 194 | 25 | 48 |
| 1994 | 194635 | 59886 | 17510 | 23825 | 3287 | 300 | 35 | 18 |
| 1995 | 63986 | 94217 | 45100 | 8323 | 8643 | 1166 | 92 | 9 |
| 1996 | 174723 | 25898 | 77702 | 22882 | 2027 | 2392 | 258 | 14 |
| 1997 | 258365 | 80922 | 11352 | 41499 | 5220 | 597 | 552 | 87 |
| 1998 | 98536 | 124123 | 53321 | 5521 | 9829 | 1241 | 174 | 152 |
| 1999 | 92769 | 42343 | 83477 | 24375 | 1812 | 2158 | 327 | 102 |
| 2000 | 55739 | 43222 | 27551 | 34087 | 5967 | 350 | 445 | 85 |
| 2001 | 97512 | 25895 | 31289 | 10961 | 8140 | 1445 | 79 | 122 |
| 2002 | 32286 | 47301 | 19491 | 13370 | 2416 | 1574 | 361 | 36 |
| 2003 | 125605 | 14617 | 39787 | 8053 | 2795 | 538 | 341 | 94 |
| 2004 | 48886 | 64204 | 10721 | 19781 | 2366 | 604 | 158 | 116 |
| 2005 | 47905 | 21539 | 52747 | 4930 | 5539 | 598 | 137 | 71 |
| 2006 | 17814 | 23741 | 14766 | 25666 | 1706 | 1369 | 154 | 41 |
| 2007 | 8743 | 7886 | 16668 | 7543 | 7984 | 754 | 451 | 62 |
| 2008 | 61453 | 3839 | 5978 | 7254 | 2782 | 1837 | 301 | 176 |
| 2009 | 24544 | 28498 | 4412 | 4204 | 2362 | 865 | 405 | 134 |
| 2010 | 36718 | 10530 | 23098 | 2945 | 1654 | 674 | 224 | 118 |
| 2011 | 29211 | 15635 | 7238 | 13243 | 1420 | 498 | 136 | 73 |
| 2012 | 64948 | 12264 | 10900 | 4447 | 4755 | 714 | 147 | 40 |
| 2013 | 38090 | 28818 | 8287 | 6250 | 1752 | 1404 | 276 | 72 |
| 2014 | 24739 | 16354 | 19924 | 4163 | 2158 | 387 | 315 | 69 |
| 2015 | 6623 | 10255 | 10701 | 9508 | 1394 | 557 | 99 | 111 |
| 2016 | 78694 | 2733 | 6924 | 4358 | 3039 | 401 | 140 | 60 |
| 2017 | 3857 | 35586 | 2127 | 3650 | 1398 | 697 | 112 | 58 |
| 2018 | 8277 | 1777 | 22722 | 1336 | 1410 | 419 | 188 | 54 |
| 2019 | 19588 | 3636 | 1285 | 15156 | 981 | 540 | 142 | 70 |
| 2020 | 19588 | 8916 | 2683 | 930 | 8674 | 465 | 241 | 94 |