| Table 3. Estimated stock numbers at age. | |||||||
| Year Age | 0 | 1 | 2 | 3 | 4 | 5 | 6 |
| 1978 | 27575461 | 8290720 | 1708583 | 851963 | 224340 | 15818 | 18590 |
| 1979 | 21790052 | 8607166 | 2079327 | 618446 | 284031 | 68733 | 10214 |
| 1980 | 10384705 | 6723969 | 2160169 | 741748 | 201352 | 86724 | 21422 |
| 1981 | 8417429 | 3074381 | 1725001 | 775633 | 236757 | 57788 | 27484 |
| 1982 | 6768451 | 2462100 | 765700 | 630630 | 254932 | 69267 | 22568 |
| 1983 | 12005751 | 1991258 | 617934 | 276178 | 221005 | 82286 | 26932 |
| 1984 | 9195858 | 3575249 | 505175 | 213471 | 87473 | 68340 | 31369 |
| 1985 | 15194653 | 2733024 | 935271 | 179650 | 67395 | 24691 | 26261 |
| 1986 | 16861703 | 4688080 | 729708 | 359945 | 63384 | 20264 | 13503 |
| 1987 | 13209004 | 5218653 | 1288519 | 269794 | 122043 | 17542 | 8075 |
| 1988 | 18914997 | 4065063 | 1469955 | 499431 | 92510 | 34460 | 5672 |
| 1989 | 11528313 | 5842212 | 1122089 | 576321 | 180996 | 28488 | 9620 |
| 1990 | 11638940 | 3480379 | 1630452 | 445495 | 213393 | 56772 | 9463 |
| 1991 | 12801506 | 3395206 | 949025 | 618304 | 165882 | 72518 | 19314 |
| 1992 | 14288247 | 3598106 | 906554 | 363768 | 234093 | 63768 | 32144 |
| 1993 | 14272431 | 3913390 | 952854 | 348203 | 136466 | 88096 | 36324 |
| 1994 | 12425051 | 3711121 | 1024151 | 358551 | 119993 | 45482 | 44313 |
| 1995 | 10915199 | 3123042 | 969196 | 404005 | 128229 | 39092 | 30540 |
| 1996 | 8073087 | 2501976 | 811673 | 390044 | 153581 | 46020 | 25037 |
| 1997 | 11157237 | 1801129 | 640828 | 342067 | 155034 | 58297 | 27136 |
| 1998 | 19652985 | 2330546 | 473355 | 275090 | 142082 | 60255 | 34659 |
| 1999 | 23908808 | 3832215 | 600733 | 209854 | 117726 | 56663 | 38757 |
| 2000 | 17379516 | 4366901 | 971139 | 257014 | 88014 | 45238 | 37753 |
| 2001 | 16796681 | 3036475 | 1135850 | 425032 | 108657 | 35343 | 32653 |
| 2002 | 8059067 | 2699759 | 798235 | 516241 | 189352 | 44544 | 28607 |
| 2003 | 7456201 | 1194086 | 680513 | 361888 | 241993 | 85863 | 33598 |
| 2004 | 8417067 | 1067819 | 289039 | 286739 | 171169 | 113512 | 57962 |
| 2005 | 8407426 | 1166320 | 268122 | 123431 | 135393 | 82589 | 83401 |
| 2006 | 7504630 | 1168358 | 304412 | 115607 | 59353 | 65450 | 81513 |
| 2007 | 12482409 | 1000711 | 315596 | 131788 | 54397 | 28235 | 70336 |
| 2008 | 12619734 | 1694443 | 284408 | 142182 | 63510 | 26094 | 47444 |
| 2009 | 13055354 | 1663853 | 490725 | 129565 | 70966 | 31198 | 35440 |
| 2010 | 13236124 | 1703891 | 479760 | 222155 | 64369 | 35995 | 31256 |
| 2011 | 8373248 | 1761268 | 506881 | 217923 | 108898 | 31050 | 30660 |
| 2012 | 6310207 | 1096447 | 548353 | 229610 | 106534 | 52909 | 29064 |
| 2013 | 10083581 | 809761 | 330848 | 254608 | 114092 | 51840 | 38687 |
| 2014 | 12729293 | 1344513 | 255715 | 153594 | 127149 | 55369 | 43174 |
| 2015 | 12346469 | 1680807 | 426707 | 119176 | 75240 | 60649 | 46733 |
| 2016 | 13425082 | 1662604 | 519347 | 194096 | 57783 | 35194 | 51022 |
| 2017 | 8111311 | 1915786 | 517939 | 230516 | 91704 | 26748 | 42293 |
| 2018 | 10073338 | 1192013 | 602572 | 234109 | 107434 | 42183 | 35313 |
| 2019 | 21296612 | 1587749 | 389573 | 273626 | 112488 | 49372 | 40820 |
| 2020 | 22300017 | 3638664 | 529781 | 183464 | 131272 | 53372 | 48560 |
| 2021 | 14520739 | 3944199 | 1265913 | 252964 | 92003 | 62265 | 57249 |
| 2022 | 13105826 | 2667429 | 1378573 | 628081 | 134817 | 46781 | 69047 |
| 2023 | 10194103 | 2625123 | 954264 | 694046 | 355669 | 72597 | 70154 |
| 2024 | 26483218 | 1968904 | 943223 | 480559 | 394661 | 193886 | 85969 |
| 2025 | 26483218 | 5248349 | 712059 | 476156 | 273930 | 214263 | 167189 |