| Table 3. Estimated stock numbers at age. | |||||||
| Year Age | 0 | 1 | 2 | 3 | 4 | 5 | 6 |
| 1978 | 30354393 | 8639043 | 1756724 | 817698 | 222689 | 16040 | 18942 |
| 1979 | 21427134 | 9769933 | 2221661 | 637731 | 279347 | 67328 | 10615 |
| 1980 | 11254095 | 6749914 | 2395243 | 773744 | 203885 | 89900 | 21667 |
| 1981 | 10932169 | 3306352 | 1922722 | 855263 | 234879 | 55867 | 27574 |
| 1982 | 8781866 | 3325605 | 839501 | 775569 | 284013 | 64124 | 21699 |
| 1983 | 13558785 | 2553627 | 853126 | 332893 | 297831 | 101239 | 26074 |
| 1984 | 10843537 | 4215591 | 654692 | 302398 | 107539 | 93364 | 39777 |
| 1985 | 17768881 | 3138542 | 1056771 | 236383 | 87295 | 28182 | 34921 |
| 1986 | 17143601 | 5617288 | 852763 | 432945 | 82200 | 25009 | 17941 |
| 1987 | 12584132 | 5335366 | 1489999 | 305808 | 149067 | 19941 | 10867 |
| 1988 | 18304927 | 3724454 | 1565275 | 542336 | 97045 | 39925 | 7418 |
| 1989 | 10432147 | 5890309 | 954870 | 586473 | 181425 | 29187 | 14078 |
| 1990 | 11231043 | 3047305 | 1749915 | 373344 | 211954 | 55622 | 13689 |
| 1991 | 13306547 | 3293399 | 781517 | 642831 | 122242 | 67682 | 21623 |
| 1992 | 15314668 | 3862532 | 884274 | 304578 | 271346 | 38800 | 32810 |
| 1993 | 15477197 | 4307763 | 913321 | 358255 | 126264 | 102784 | 27326 |
| 1994 | 14189928 | 4205016 | 1049681 | 340010 | 125708 | 45877 | 43151 |
| 1995 | 10104248 | 3685154 | 1066670 | 425748 | 119167 | 41879 | 32035 |
| 1996 | 8383490 | 2336257 | 884903 | 446184 | 169491 | 42908 | 29542 |
| 1997 | 13401604 | 1862256 | 558381 | 389041 | 168835 | 67560 | 30237 |
| 1998 | 21705889 | 2897387 | 464592 | 235131 | 158705 | 66259 | 44018 |
| 1999 | 22657140 | 4417960 | 722194 | 196665 | 115348 | 67160 | 48441 |
| 2000 | 16926033 | 4179518 | 1118176 | 285576 | 84659 | 46909 | 50945 |
| 2001 | 14795123 | 2945687 | 1139158 | 454148 | 115599 | 33492 | 43041 |
| 2002 | 7457369 | 2449575 | 828293 | 591006 | 215492 | 49931 | 34780 |
| 2003 | 7270744 | 1109270 | 656561 | 412735 | 310417 | 99680 | 41909 |
| 2004 | 7491267 | 1058715 | 266418 | 269487 | 211373 | 146318 | 76044 |
| 2005 | 8211221 | 1045190 | 288893 | 113747 | 136846 | 108855 | 115609 |
| 2006 | 6068682 | 1157814 | 312495 | 123495 | 56288 | 74503 | 117237 |
| 2007 | 9288443 | 779572 | 310357 | 148860 | 53575 | 27646 | 98105 |
| 2008 | 9939253 | 1227222 | 230089 | 141184 | 71827 | 23977 | 64238 |
| 2009 | 9981120 | 1343479 | 346694 | 99914 | 63572 | 35873 | 44079 |
| 2010 | 9311207 | 1316674 | 403428 | 145540 | 48046 | 32498 | 37754 |
| 2011 | 6381557 | 1234147 | 422624 | 178882 | 68562 | 22982 | 31745 |
| 2012 | 4939474 | 835491 | 408137 | 174194 | 86013 | 34240 | 26052 |
| 2013 | 8878871 | 605788 | 234327 | 203888 | 86315 | 38093 | 27509 |
| 2014 | 10905040 | 1183912 | 198213 | 110193 | 102107 | 40533 | 29289 |
| 2015 | 9268758 | 1415339 | 390015 | 85694 | 52529 | 48172 | 30343 |
| 2016 | 11987721 | 1218347 | 395646 | 165780 | 39785 | 23380 | 32826 |
| 2017 | 7108693 | 1744804 | 385666 | 159730 | 67987 | 17478 | 23084 |
| 2018 | 10488736 | 1011687 | 526844 | 177013 | 71650 | 27574 | 17202 |
| 2019 | 20419598 | 1644411 | 345689 | 232703 | 84059 | 29889 | 19010 |
| 2020 | 18901866 | 3518569 | 502968 | 172122 | 107768 | 36033 | 21182 |
| 2021 | 8543444 | 3461318 | 1244025 | 226982 | 87185 | 47175 | 27452 |
| 2022 | 10675605 | 1480000 | 1191206 | 646679 | 117626 | 44472 | 37140 |
| 2023 | 6866325 | 2164500 | 561113 | 629427 | 375946 | 59653 | 44919 |
| 2024 | 14929174 | 1245270 | 737744 | 302739 | 389744 | 209877 | 58322 |
| 2025 | 14929174 | 3004205 | 452691 | 359205 | 167311 | 210894 | 153791 |