| Table 3. Estimated stock numbers at age. | ||||||||
| Year Age | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 
| 1985 | 573936 | 226514 | 102134 | 25687 | 6739 | 3456 | 8704 | 1316 | 
| 1986 | 918660 | 151232 | 88486 | 32872 | 6479 | 1336 | 633 | 1558 | 
| 1987 | 545143 | 470284 | 74998 | 35955 | 11572 | 1870 | 440 | 547 | 
| 1988 | 578563 | 134061 | 154615 | 29026 | 11125 | 3234 | 448 | 204 | 
| 1989 | 594121 | 184138 | 33228 | 43000 | 9841 | 2370 | 626 | 103 | 
| 1990 | 731711 | 172264 | 70327 | 8611 | 11009 | 2767 | 415 | 109 | 
| 1991 | 912688 | 234022 | 54342 | 36682 | 3166 | 3478 | 730 | 124 | 
| 1992 | 708995 | 363208 | 91670 | 21581 | 15844 | 1174 | 946 | 225 | 
| 1993 | 694000 | 207097 | 130007 | 33170 | 7818 | 6120 | 404 | 342 | 
| 1994 | 706413 | 223184 | 78136 | 50067 | 12154 | 2650 | 1922 | 218 | 
| 1995 | 731815 | 230236 | 99211 | 35022 | 17080 | 3964 | 887 | 644 | 
| 1996 | 761719 | 236972 | 84257 | 33964 | 12899 | 5041 | 1266 | 394 | 
| 1997 | 719160 | 218812 | 65648 | 32460 | 10994 | 3423 | 1032 | 390 | 
| 1998 | 469384 | 270907 | 65297 | 19325 | 10485 | 3019 | 908 | 528 | 
| 1999 | 826788 | 102441 | 72985 | 15257 | 5220 | 3003 | 575 | 394 | 
| 2000 | 427379 | 447879 | 35193 | 16750 | 3272 | 1137 | 634 | 243 | 
| 2001 | 303756 | 105171 | 114743 | 11865 | 4123 | 920 | 301 | 173 | 
| 2002 | 309026 | 92087 | 42080 | 28216 | 3853 | 1229 | 212 | 147 | 
| 2003 | 219206 | 104938 | 21977 | 13571 | 7683 | 1337 | 454 | 121 | 
| 2004 | 127198 | 81516 | 29602 | 5455 | 3549 | 2036 | 342 | 218 | 
| 2005 | 109976 | 31920 | 20937 | 7521 | 1149 | 684 | 341 | 163 | 
| 2006 | 72273 | 37284 | 9892 | 7567 | 2721 | 420 | 345 | 182 | 
| 2007 | 56961 | 18969 | 14265 | 4926 | 3085 | 1244 | 249 | 256 | 
| 2008 | 87244 | 14512 | 6790 | 6083 | 2317 | 1378 | 549 | 247 | 
| 2009 | 210373 | 34839 | 6495 | 3257 | 3116 | 968 | 605 | 381 | 
| 2010 | 121749 | 108624 | 15806 | 3975 | 1697 | 1631 | 477 | 521 | 
| 2011 | 211177 | 26139 | 42922 | 7927 | 2236 | 903 | 993 | 456 | 
| 2012 | 156940 | 85808 | 12114 | 21292 | 4282 | 1189 | 479 | 612 | 
| 2013 | 301307 | 45765 | 30366 | 7060 | 11350 | 2118 | 652 | 485 | 
| 2014 | 421977 | 119119 | 8485 | 10409 | 4221 | 4857 | 1102 | 610 | 
| 2015 | 379908 | 140416 | 35879 | 7474 | 7096 | 2476 | 3062 | 892 | 
| 2016 | 308744 | 113228 | 75536 | 14734 | 4119 | 3616 | 1405 | 1868 | 
| 2017 | 257100 | 108489 | 40521 | 35634 | 5781 | 2371 | 1638 | 1258 | 
| 2018 | 359071 | 59707 | 42158 | 19217 | 15251 | 2581 | 593 | 1040 | 
| 2019 | 368002 | 142596 | 21795 | 19062 | 9039 | 5781 | 1407 | 663 | 
| 2020 | 368002 | 128909 | 59277 | 12095 | 12012 | 5790 | 3673 | 1263 |