| Table 3. Estimated stock numbers at age. | |||||||
| Year Age | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| 1980 | 17486 | 4992 | 702 | 300 | 89 | 71 | 21 |
| 1981 | 7836 | 6693 | 1332 | 226 | 95 | 29 | 23 |
| 1982 | 3784 | 2971 | 1869 | 396 | 76 | 33 | 13 |
| 1983 | 8006 | 1431 | 869 | 636 | 141 | 28 | 15 |
| 1984 | 8843 | 3160 | 396 | 267 | 215 | 50 | 12 |
| 1985 | 7812 | 3641 | 1030 | 148 | 104 | 84 | 23 |
| 1986 | 8832 | 3166 | 1164 | 376 | 62 | 44 | 35 |
| 1987 | 26474 | 3413 | 940 | 377 | 130 | 25 | 26 |
| 1988 | 13415 | 10832 | 973 | 310 | 122 | 46 | 16 |
| 1989 | 4690 | 5460 | 3514 | 362 | 121 | 46 | 21 |
| 1990 | 6419 | 1785 | 1627 | 1117 | 148 | 45 | 23 |
| 1991 | 16582 | 2383 | 466 | 480 | 349 | 58 | 21 |
| 1992 | 18471 | 6143 | 583 | 130 | 138 | 105 | 23 |
| 1993 | 10467 | 6845 | 1574 | 162 | 42 | 43 | 34 |
| 1994 | 20442 | 3745 | 1791 | 458 | 53 | 14 | 23 |
| 1995 | 16034 | 7572 | 900 | 487 | 143 | 18 | 10 |
| 1996 | 11590 | 5916 | 1986 | 283 | 151 | 49 | 8 |
| 1997 | 12009 | 4191 | 1492 | 564 | 102 | 47 | 15 |
| 1998 | 7505 | 4506 | 1080 | 421 | 188 | 41 | 18 |
| 1999 | 4134 | 2746 | 1147 | 299 | 128 | 65 | 19 |
| 2000 | 15163 | 1426 | 680 | 311 | 94 | 42 | 26 |
| 2001 | 13436 | 5736 | 343 | 189 | 99 | 33 | 23 |
| 2002 | 5200 | 4946 | 1459 | 99 | 60 | 30 | 17 |
| 2003 | 3449 | 1827 | 1153 | 377 | 31 | 20 | 14 |
| 2004 | 4926 | 1285 | 444 | 301 | 117 | 11 | 11 |
| 2005 | 7356 | 1988 | 286 | 135 | 94 | 40 | 8 |
| 2006 | 7600 | 2541 | 478 | 63 | 43 | 31 | 15 |
| 2007 | 5674 | 2677 | 696 | 147 | 21 | 16 | 16 |
| 2008 | 2182 | 2074 | 701 | 209 | 51 | 8 | 10 |
| 2009 | 4977 | 846 | 600 | 219 | 73 | 19 | 6 |
| 2010 | 22750 | 1853 | 255 | 185 | 79 | 25 | 8 |
| 2011 | 8838 | 9112 | 594 | 90 | 66 | 29 | 10 |
| 2012 | 1734 | 3501 | 2691 | 200 | 36 | 24 | 14 |
| 2013 | 2298 | 638 | 947 | 791 | 70 | 14 | 11 |
| 2014 | 10980 | 831 | 164 | 264 | 253 | 21 | 6 |
| 2015 | 1076 | 4379 | 240 | 49 | 90 | 84 | 9 |
| 2016 | 2219 | 399 | 1138 | 75 | 16 | 30 | 27 |
| 2017 | 725 | 817 | 108 | 286 | 27 | 6 | 16 |
| 2018 | 1284 | 248 | 168 | 26 | 69 | 7 | 4 |
| 2019 | 3269 | 402 | 50 | 34 | 7 | 17 | 3 |
| 2020 | 1079 | 1149 | 72 | 11 | 7 | 2 | 4 |
| 2021 | 442 | 373 | 238 | 18 | 4 | 2 | 1 |
| 2022 | 835 | 128 | 64 | 46 | 4 | 1 | 1 |
| 2023 | 104 | 276 | 27 | 12 | 11 | 1 | 0 |
| 2024 | 77 | 36 | 48 | 5 | 3 | 3 | 0 |
| 2025 | 183 | 22 | 5 | 7 | 1 | 0 | 0 |