| Table 3. Estimated stock numbers at age. | ||||||
| Year Age | 0 | 1 | 2 | 3 | 4 | 5 |
| 1986 | 27352 | 8550 | 3989 | 699 | 259 | 29 |
| 1987 | 31994 | 9808 | 3379 | 932 | 134 | 35 |
| 1988 | 38278 | 11496 | 4279 | 1003 | 290 | 36 |
| 1989 | 33387 | 13749 | 4816 | 1114 | 245 | 55 |
| 1990 | 33672 | 12019 | 6128 | 1458 | 329 | 58 |
| 1991 | 26839 | 12096 | 4851 | 1552 | 319 | 62 |
| 1992 | 26178 | 9665 | 5453 | 1664 | 531 | 76 |
| 1993 | 27031 | 9428 | 4163 | 1590 | 555 | 178 |
| 1994 | 32912 | 9735 | 4087 | 1238 | 485 | 167 |
| 1995 | 30112 | 11835 | 3891 | 1153 | 358 | 83 |
| 1996 | 31294 | 10829 | 4826 | 898 | 335 | 110 |
| 1997 | 27753 | 11206 | 3915 | 853 | 89 | 22 |
| 1998 | 21754 | 9942 | 3783 | 623 | 147 | 8 |
| 1999 | 20930 | 7836 | 4269 | 742 | 95 | 15 |
| 2000 | 17389 | 7540 | 3137 | 713 | 134 | 12 |
| 2001 | 15951 | 6267 | 3142 | 612 | 151 | 24 |
| 2002 | 10878 | 5748 | 2661 | 729 | 150 | 38 |
| 2003 | 6309 | 3920 | 2484 | 649 | 188 | 43 |
| 2004 | 4727 | 2273 | 1590 | 573 | 144 | 29 |
| 2005 | 3629 | 1697 | 713 | 175 | 34 | 4 |
| 2006 | 3129 | 1284 | 297 | 67 | 13 | 4 |
| 2007 | 3384 | 1068 | 201 | 67 | 18 | 2 |
| 2008 | 3427 | 1139 | 244 | 50 | 22 | 5 |
| 2009 | 3020 | 1094 | 190 | 42 | 11 | 5 |
| 2010 | 2371 | 999 | 208 | 40 | 9 | 2 |
| 2011 | 2363 | 811 | 196 | 54 | 11 | 1 |
| 2012 | 2498 | 841 | 237 | 57 | 22 | 4 |
| 2013 | 2984 | 892 | 272 | 62 | 19 | 5 |
| 2014 | 3682 | 1073 | 370 | 103 | 25 | 7 |
| 2015 | 3298 | 1320 | 398 | 126 | 44 | 10 |
| 2016 | 2121 | 1182 | 528 | 159 | 60 | 26 |
| 2017 | 1557 | 760 | 512 | 216 | 74 | 44 |
| 2018 | 1560 | 561 | 393 | 213 | 69 | 46 |
| 2019 | 1805 | 562 | 295 | 167 | 46 | 29 |
| 2020 | 1919 | 651 | 298 | 146 | 48 | 22 |
| 2021 | 1919 | 692 | 340 | 109 | 29 | 17 |