| Table 3. Estimated stock numbers at age. | |||||||
| Year Age | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| 1981 | 9105 | 21142 | 7094 | 1946 | 436 | 59 | 48 |
| 1982 | 23251 | 4999 | 7773 | 2543 | 728 | 190 | 42 |
| 1983 | 14300 | 12226 | 2221 | 2761 | 893 | 259 | 80 |
| 1984 | 22844 | 6424 | 4909 | 785 | 903 | 299 | 102 |
| 1985 | 10747 | 11502 | 2357 | 1570 | 235 | 251 | 110 |
| 1986 | 18255 | 4276 | 4119 | 719 | 360 | 66 | 83 |
| 1987 | 50215 | 10038 | 1724 | 1389 | 220 | 99 | 42 |
| 1988 | 7025 | 20912 | 3760 | 512 | 352 | 63 | 38 |
| 1989 | 21224 | 2702 | 6646 | 1152 | 162 | 98 | 30 |
| 1990 | 9411 | 9281 | 917 | 1670 | 320 | 43 | 31 |
| 1991 | 12381 | 3626 | 3367 | 334 | 452 | 108 | 24 |
| 1992 | 20895 | 4947 | 1058 | 1081 | 115 | 114 | 38 |
| 1993 | 6620 | 8976 | 1761 | 274 | 297 | 37 | 46 |
| 1994 | 14374 | 3143 | 3150 | 491 | 89 | 84 | 25 |
| 1995 | 9615 | 6240 | 1228 | 1033 | 132 | 27 | 28 |
| 1996 | 3997 | 4430 | 1869 | 364 | 294 | 40 | 15 |
| 1997 | 16190 | 1869 | 1415 | 467 | 104 | 87 | 14 |
| 1998 | 5538 | 7976 | 552 | 360 | 129 | 30 | 26 |
| 1999 | 3757 | 2160 | 2152 | 133 | 98 | 43 | 16 |
| 2000 | 13830 | 1641 | 595 | 537 | 36 | 28 | 18 |
| 2001 | 4203 | 5738 | 530 | 180 | 165 | 10 | 13 |
| 2002 | 7425 | 1778 | 1797 | 140 | 42 | 42 | 7 |
| 2003 | 2475 | 2874 | 482 | 521 | 40 | 10 | 11 |
| 2004 | 3038 | 919 | 691 | 100 | 133 | 12 | 5 |
| 2005 | 1784 | 1037 | 238 | 179 | 28 | 27 | 3 |
| 2006 | 7155 | 637 | 333 | 54 | 42 | 6 | 6 |
| 2007 | 1907 | 3306 | 201 | 101 | 9 | 9 | 3 |
| 2008 | 1313 | 666 | 1049 | 52 | 27 | 2 | 3 |
| 2009 | 5097 | 587 | 249 | 248 | 14 | 9 | 1 |
| 2010 | 5135 | 2487 | 264 | 62 | 38 | 2 | 2 |
| 2011 | 2180 | 2500 | 927 | 62 | 14 | 10 | 1 |
| 2012 | 4173 | 1044 | 1046 | 221 | 12 | 4 | 3 |
| 2013 | 7208 | 1855 | 490 | 335 | 49 | 3 | 2 |
| 2014 | 5808 | 3408 | 784 | 167 | 91 | 12 | 1 |
| 2015 | 5059 | 2677 | 1565 | 247 | 52 | 29 | 3 |
| 2016 | 2197 | 2617 | 1163 | 577 | 71 | 16 | 9 |
| 2017 | 1734 | 1013 | 1295 | 401 | 177 | 21 | 7 |
| 2018 | 1318 | 860 | 395 | 421 | 107 | 50 | 8 |
| 2019 | 2927 | 569 | 347 | 110 | 97 | 24 | 14 |