| Table 3. Estimated stock numbers at age. | ||||||||
| Year Age | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 
| 1985 | 484011 | 49497 | 25404 | 23042 | 4360 | 1131 | 371 | 211 | 
| 1986 | 169648 | 139212 | 21815 | 8696 | 4881 | 829 | 290 | 137 | 
| 1987 | 79216 | 44525 | 71921 | 7534 | 1947 | 940 | 199 | 107 | 
| 1988 | 89629 | 19955 | 21618 | 22477 | 1949 | 441 | 244 | 93 | 
| 1989 | 139921 | 23467 | 7846 | 8261 | 5020 | 482 | 124 | 89 | 
| 1990 | 220716 | 37426 | 11925 | 3517 | 2314 | 1262 | 152 | 72 | 
| 1991 | 387383 | 58648 | 20025 | 4474 | 860 | 494 | 340 | 80 | 
| 1992 | 176247 | 113749 | 27908 | 6626 | 1022 | 157 | 122 | 105 | 
| 1993 | 345739 | 42678 | 54093 | 10172 | 1508 | 210 | 22 | 51 | 
| 1994 | 477252 | 94801 | 21477 | 25601 | 3375 | 264 | 32 | 17 | 
| 1995 | 189951 | 139118 | 56247 | 9244 | 8899 | 1235 | 90 | 8 | 
| 1996 | 531595 | 44479 | 94549 | 26535 | 2130 | 2642 | 245 | 10 | 
| 1997 | 796158 | 148525 | 12456 | 48093 | 5383 | 599 | 538 | 89 | 
| 1998 | 318050 | 233322 | 70215 | 5750 | 9832 | 1226 | 172 | 141 | 
| 1999 | 283941 | 80565 | 102219 | 26447 | 2075 | 2062 | 327 | 109 | 
| 2000 | 143952 | 79474 | 34561 | 37664 | 6156 | 381 | 434 | 86 | 
| 2001 | 342116 | 48273 | 44592 | 13092 | 8569 | 1507 | 92 | 128 | 
| 2002 | 100773 | 102882 | 28832 | 16503 | 2970 | 1697 | 408 | 37 | 
| 2003 | 374120 | 28439 | 59751 | 10907 | 3017 | 570 | 356 | 107 | 
| 2004 | 122546 | 114737 | 13604 | 23451 | 3118 | 626 | 175 | 126 | 
| 2005 | 124522 | 32706 | 69524 | 5079 | 5974 | 654 | 140 | 76 | 
| 2006 | 40950 | 39256 | 16209 | 29285 | 1571 | 1317 | 147 | 35 | 
| 2007 | 14921 | 10567 | 22009 | 7333 | 7229 | 708 | 401 | 52 | 
| 2008 | 163775 | 3849 | 6424 | 8022 | 2452 | 1606 | 300 | 162 | 
| 2009 | 60254 | 45229 | 4961 | 4301 | 2475 | 827 | 350 | 127 | 
| 2010 | 98504 | 15111 | 26610 | 3558 | 1682 | 700 | 218 | 104 | 
| 2011 | 73422 | 23956 | 7241 | 12500 | 2254 | 501 | 130 | 68 | 
| 2012 | 181195 | 18722 | 12244 | 4321 | 4555 | 886 | 137 | 31 | 
| 2013 | 104799 | 47866 | 9318 | 6275 | 1784 | 1282 | 306 | 70 | 
| 2014 | 64015 | 27272 | 24142 | 4294 | 2030 | 361 | 288 | 62 | 
| 2015 | 14146 | 15469 | 13186 | 10657 | 1240 | 484 | 82 | 98 | 
| 2016 | 195961 | 2976 | 8178 | 4782 | 2670 | 358 | 110 | 50 | 
| 2017 | 7653 | 51908 | 1767 | 3578 | 1190 | 564 | 86 | 43 | 
| 2018 | 15629 | 1906 | 22596 | 682 | 902 | 262 | 117 | 31 | 
| 2019 | 37684 | 3939 | 613 | 12367 | 276 | 225 | 49 | 26 | 
| 2020 | 58814 | 9473 | 1905 | 206 | 3231 | 75 | 32 | 10 | 
| 2021 | 58814 | 17111 | 4991 | 902 | 66 | 775 | 14 | 8 |