| Table 3. Estimated stock numbers at age. | ||||||||
| Year Age | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 
| 1985 | 756644 | 311489 | 112777 | 26972 | 6376 | 3118 | 8439 | 1329 | 
| 1986 | 1380015 | 237329 | 103873 | 35894 | 7516 | 1390 | 603 | 1561 | 
| 1987 | 500698 | 520007 | 88178 | 38619 | 11696 | 2239 | 369 | 540 | 
| 1988 | 731681 | 146402 | 167291 | 32855 | 11278 | 2962 | 467 | 194 | 
| 1989 | 643096 | 244525 | 42060 | 47256 | 9902 | 2399 | 475 | 98 | 
| 1990 | 885785 | 199613 | 86366 | 12012 | 12201 | 2543 | 390 | 83 | 
| 1991 | 1114919 | 291381 | 62317 | 36972 | 3916 | 3597 | 651 | 106 | 
| 1992 | 698325 | 384397 | 97306 | 22485 | 13347 | 1288 | 897 | 187 | 
| 1993 | 693113 | 219788 | 135296 | 33873 | 7762 | 4390 | 375 | 280 | 
| 1994 | 671533 | 227260 | 80314 | 49985 | 11586 | 2543 | 1277 | 170 | 
| 1995 | 589891 | 221381 | 86041 | 33230 | 16946 | 3896 | 710 | 396 | 
| 1996 | 570718 | 188746 | 79373 | 31052 | 11449 | 4967 | 1041 | 239 | 
| 1997 | 587576 | 169541 | 57691 | 27869 | 8947 | 2902 | 1043 | 247 | 
| 1998 | 324973 | 197863 | 52701 | 18087 | 8812 | 2306 | 659 | 378 | 
| 1999 | 709262 | 93192 | 57413 | 13935 | 4691 | 2044 | 380 | 229 | 
| 2000 | 277705 | 249242 | 29093 | 14679 | 3070 | 950 | 302 | 119 | 
| 2001 | 153338 | 77452 | 63754 | 8459 | 2799 | 565 | 125 | 49 | 
| 2002 | 197637 | 45339 | 23490 | 17798 | 2274 | 616 | 94 | 32 | 
| 2003 | 134773 | 60519 | 11641 | 7673 | 4380 | 566 | 140 | 27 | 
| 2004 | 78060 | 45189 | 17631 | 3502 | 2297 | 1075 | 128 | 53 | 
| 2005 | 74844 | 20890 | 11610 | 4944 | 811 | 478 | 163 | 38 | 
| 2006 | 41205 | 22620 | 6076 | 4173 | 1716 | 245 | 169 | 56 | 
| 2007 | 28183 | 10899 | 7079 | 2389 | 1469 | 551 | 85 | 75 | 
| 2008 | 39089 | 8556 | 3274 | 2886 | 925 | 517 | 173 | 55 | 
| 2009 | 144228 | 14151 | 2900 | 1353 | 1234 | 327 | 173 | 81 | 
| 2010 | 49982 | 49662 | 4623 | 1133 | 518 | 441 | 97 | 91 | 
| 2011 | 101322 | 12747 | 12665 | 1783 | 351 | 146 | 117 | 46 | 
| 2012 | 40312 | 31029 | 3818 | 5691 | 740 | 152 | 54 | 53 | 
| 2013 | 88658 | 12167 | 8045 | 1731 | 2309 | 310 | 59 | 37 | 
| 2014 | 178419 | 27531 | 2639 | 2701 | 897 | 845 | 109 | 39 | 
| 2015 | 164725 | 56887 | 7375 | 1431 | 1236 | 387 | 362 | 67 | 
| 2016 | 142660 | 46683 | 19644 | 2906 | 698 | 456 | 153 | 172 | 
| 2017 | 132279 | 48780 | 14591 | 9608 | 1385 | 307 | 197 | 129 | 
| 2018 | 179672 | 37129 | 17565 | 6559 | 4764 | 751 | 106 | 141 | 
| 2019 | 166277 | 64323 | 13394 | 8999 | 3378 | 2119 | 423 | 111 | 
| 2020 | 166277 | 55308 | 24994 | 6278 | 4677 | 1752 | 1087 | 295 |