| Table 3. Estimated stock numbers at age. | |||||||||
| Year Age | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 
| 1991 | 4527286 | 4683835 | 2108413 | 1825345 | 957905 | 594921 | 163684 | 47016 | 17493 | 
| 1992 | 3575638 | 3333862 | 2221777 | 1257450 | 1019815 | 481444 | 288711 | 85848 | 34009 | 
| 1993 | 2872232 | 2634864 | 1720567 | 1247323 | 717781 | 531193 | 229576 | 129039 | 49596 | 
| 1994 | 4851352 | 1888888 | 1248082 | 1045194 | 633213 | 369407 | 238679 | 94557 | 65181 | 
| 1995 | 4290532 | 3641591 | 920586 | 647530 | 619542 | 271093 | 171667 | 92039 | 57122 | 
| 1996 | 4468456 | 2948046 | 1451912 | 487775 | 303957 | 256948 | 117508 | 59783 | 50706 | 
| 1997 | 3812376 | 3152820 | 1243508 | 766981 | 244827 | 128449 | 97272 | 42612 | 43093 | 
| 1998 | 4718887 | 2583537 | 1384826 | 674771 | 397113 | 119423 | 59735 | 33910 | 29431 | 
| 1999 | 5201164 | 3305588 | 1111307 | 717400 | 351345 | 193668 | 51575 | 27283 | 19324 | 
| 2000 | 3278548 | 3831359 | 1528262 | 604934 | 372795 | 185611 | 85088 | 23935 | 18094 | 
| 2001 | 3432699 | 2226835 | 1737247 | 852378 | 306265 | 179755 | 83261 | 35829 | 13825 | 
| 2002 | 2639972 | 2502643 | 948400 | 967779 | 487810 | 145286 | 86451 | 30383 | 17920 | 
| 2003 | 3073050 | 1761267 | 1105276 | 521406 | 518994 | 250712 | 65732 | 35720 | 18119 | 
| 2004 | 2216942 | 2323488 | 898733 | 648016 | 306994 | 273163 | 125052 | 32138 | 23467 | 
| 2005 | 1878230 | 1539885 | 1192074 | 570617 | 364610 | 159144 | 138998 | 57696 | 23227 | 
| 2006 | 1512682 | 1347493 | 715558 | 703401 | 339928 | 191307 | 80729 | 56912 | 30814 | 
| 2007 | 1505326 | 1067421 | 691240 | 422095 | 384972 | 185788 | 77002 | 44191 | 33054 | 
| 2008 | 1383714 | 1116166 | 495115 | 402245 | 233339 | 200508 | 96733 | 33477 | 32944 | 
| 2009 | 1242353 | 1019153 | 588677 | 279953 | 203052 | 122770 | 89292 | 44511 | 27121 | 
| 2010 | 1697112 | 840003 | 487992 | 322222 | 163278 | 104738 | 59166 | 32925 | 30558 | 
| 2011 | 1464577 | 1281764 | 425755 | 273332 | 187055 | 89401 | 58922 | 32714 | 28200 | 
| 2012 | 1173046 | 1069711 | 725271 | 288225 | 165663 | 114793 | 51189 | 28184 | 36868 | 
| 2013 | 1515129 | 834940 | 571992 | 495577 | 185116 | 93083 | 62216 | 27858 | 30461 | 
| 2014 | 1369345 | 1177307 | 411786 | 359993 | 323779 | 98636 | 53668 | 29929 | 29956 | 
| 2015 | 995409 | 1050722 | 729790 | 291547 | 230672 | 159767 | 59335 | 28289 | 33149 | 
| 2016 | 1097120 | 685411 | 586856 | 499389 | 196423 | 128790 | 79243 | 29829 | 29772 | 
| 2017 | 994446 | 834789 | 362781 | 315171 | 331291 | 113926 | 70516 | 34950 | 22879 | 
| 2018 | 966401 | 737112 | 467294 | 209335 | 159087 | 212969 | 60565 | 31633 | 20520 | 
| 2019 | 1004936 | 719691 | 397356 | 251313 | 122241 | 95967 | 99853 | 29391 | 20719 | 
| 2020 | 379037 | 834285 | 399116 | 247754 | 151996 | 73734 | 66250 | 49988 | 26120 | 
| 2021 | 503505 | 244600 | 549247 | 264089 | 167029 | 103969 | 47080 | 38175 | 45556 |