| Table 3. Estimated stock numbers at age. | ||||||
| Year Age | 1 | 2 | 3 | 4 | 5 | 6 |
| 1997 | 17522 | 6187 | 9014 | 1432 | 324 | 132 |
| 1998 | 13965 | 11665 | 2738 | 2682 | 374 | 111 |
| 1999 | 13127 | 8935 | 5688 | 704 | 575 | 106 |
| 2000 | 7404 | 8413 | 3616 | 1397 | 161 | 144 |
| 2001 | 6271 | 4365 | 3074 | 840 | 261 | 60 |
| 2002 | 12084 | 3878 | 1639 | 680 | 139 | 59 |
| 2003 | 2648 | 6973 | 1397 | 423 | 172 | 43 |
| 2004 | 14131 | 1804 | 2320 | 361 | 122 | 69 |
| 2005 | 6032 | 7048 | 398 | 479 | 65 | 35 |
| 2006 | 7604 | 3593 | 2170 | 123 | 135 | 31 |
| 2007 | 2070 | 3385 | 868 | 486 | 41 | 60 |
| 2008 | 1047 | 639 | 422 | 134 | 88 | 21 |
| 2009 | 3314 | 402 | 105 | 80 | 26 | 18 |
| 2010 | 2853 | 1520 | 109 | 30 | 15 | 8 |
| 2011 | 3528 | 1435 | 425 | 32 | 9 | 5 |
| 2012 | 8233 | 1762 | 343 | 142 | 15 | 6 |
| 2013 | 10065 | 3902 | 614 | 160 | 54 | 11 |
| 2014 | 3709 | 5917 | 1282 | 339 | 93 | 37 |
| 2015 | 2890 | 1672 | 2108 | 799 | 216 | 84 |
| 2016 | 801 | 1221 | 695 | 863 | 400 | 155 |
| 2017 | 5241 | 556 | 511 | 277 | 299 | 179 |
| 2018 | 543 | 1806 | 110 | 169 | 92 | 132 |
| 2019 | 1164 | 261 | 303 | 29 | 34 | 24 |
| 2020 | 2561 | 599 | 35 | 67 | 3 | 8 |
| 2021 | 961 | 876 | 94 | 7 | 20 | 2 |
| 2022 | 1760 | 349 | 92 | 19 | 2 | 6 |
| 2023 | 5138 | 577 | 50 | 27 | 4 | 2 |
| 2024 | 2154 | 1515 | 55 | 11 | 5 | 1 |
| 2025 | 2880 | 1175 | 278 | 16 | 2 | 1 |
| 2026 | 2300 | 1243 | 211 | 90 | 5 | 1 |