| Table 3. Estimated stock numbers at age. | |||||||
| Year Age | 0 | 1 | 2 | 3 | 4 | 5 | 6 |
| 1978 | 26043936 | 8332084 | 1722399 | 842585 | 224117 | 15765 | 18546 |
| 1979 | 20481486 | 8396617 | 2107704 | 622925 | 281828 | 68203 | 10101 |
| 1980 | 12749530 | 6565203 | 2137940 | 748202 | 200845 | 87043 | 21216 |
| 1981 | 11076375 | 3604135 | 1805916 | 778948 | 235098 | 56757 | 27223 |
| 1982 | 8405915 | 3186489 | 886760 | 712145 | 258732 | 67183 | 21569 |
| 1983 | 12089547 | 2374210 | 797340 | 329746 | 267026 | 84554 | 25289 |
| 1984 | 10428569 | 3646469 | 630405 | 284235 | 105738 | 85005 | 30751 |
| 1985 | 14284674 | 2980079 | 1008270 | 231657 | 88392 | 29000 | 29722 |
| 1986 | 14901106 | 4676002 | 809818 | 415255 | 80654 | 25396 | 14888 |
| 1987 | 12767313 | 4760584 | 1382967 | 304499 | 141663 | 20936 | 9472 |
| 1988 | 16513837 | 3935756 | 1455889 | 557689 | 101178 | 37916 | 6591 |
| 1989 | 11273737 | 5432222 | 1102464 | 602054 | 200482 | 29692 | 10791 |
| 1990 | 11555838 | 3408470 | 1648576 | 448529 | 226025 | 62053 | 10185 |
| 1991 | 12371553 | 3327644 | 966408 | 662066 | 167235 | 76090 | 21581 |
| 1992 | 12597272 | 3474103 | 923789 | 387860 | 264144 | 64681 | 34418 |
| 1993 | 13068868 | 3602160 | 937860 | 371087 | 151460 | 103134 | 37013 |
| 1994 | 11387042 | 3511273 | 1004744 | 368837 | 136497 | 53121 | 53195 |
| 1995 | 11614563 | 3013292 | 975082 | 425599 | 138505 | 46688 | 38505 |
| 1996 | 8413040 | 2564857 | 851034 | 418369 | 172587 | 52017 | 32301 |
| 1997 | 10786839 | 1856631 | 667699 | 378317 | 172808 | 69975 | 33674 |
| 1998 | 18450816 | 2338209 | 502163 | 291660 | 163361 | 71226 | 44922 |
| 1999 | 20504451 | 3868914 | 635838 | 231779 | 131736 | 69486 | 51229 |
| 2000 | 13571265 | 4003540 | 1022735 | 280341 | 101784 | 54415 | 52946 |
| 2001 | 14440714 | 2647489 | 1124298 | 449565 | 120704 | 44295 | 45842 |
| 2002 | 9690339 | 2500957 | 782209 | 550764 | 208814 | 51378 | 40073 |
| 2003 | 8302413 | 1352339 | 700347 | 393985 | 275064 | 100947 | 43130 |
| 2004 | 8445462 | 1166724 | 318833 | 310455 | 200291 | 135150 | 73791 |
| 2005 | 7714269 | 1187489 | 306994 | 138844 | 153909 | 102736 | 106779 |
| 2006 | 7313536 | 1153015 | 337621 | 137780 | 68938 | 78044 | 109902 |
| 2007 | 9733877 | 980611 | 336856 | 156479 | 66500 | 33550 | 96821 |
| 2008 | 11281261 | 1506862 | 304196 | 160709 | 78255 | 32475 | 67294 |
| 2009 | 11785733 | 1616930 | 490166 | 145027 | 83883 | 40262 | 53086 |
| 2010 | 10584923 | 1606146 | 500829 | 230679 | 72934 | 45807 | 48393 |
| 2011 | 7904807 | 1564021 | 521563 | 238878 | 114652 | 35441 | 45858 |
| 2012 | 6506161 | 1116602 | 559652 | 242500 | 118339 | 56918 | 40510 |
| 2013 | 9227608 | 820033 | 349728 | 278087 | 124056 | 59190 | 47685 |
| 2014 | 12143798 | 1350392 | 281405 | 171206 | 144299 | 62250 | 53431 |
| 2015 | 12211466 | 1689265 | 485630 | 137303 | 85569 | 71478 | 57194 |
| 2016 | 13033058 | 1654297 | 555216 | 231151 | 68420 | 41514 | 63064 |
| 2017 | 9504294 | 1993869 | 542850 | 250676 | 112354 | 32910 | 52288 |
| 2018 | 10696230 | 1355940 | 670439 | 254067 | 119818 | 54049 | 43318 |
| 2019 | 16792122 | 1753565 | 467265 | 312493 | 127928 | 56863 | 51060 |
| 2020 | 19315290 | 3372271 | 616872 | 226692 | 152755 | 64974 | 56361 |
| 2021 | 13836504 | 3745299 | 1360933 | 300099 | 115553 | 73516 | 66600 |
| 2022 | 10661750 | 2481929 | 1441863 | 739584 | 165214 | 61225 | 79449 |
| 2023 | 9331422 | 2372817 | 937674 | 776037 | 447796 | 91265 | 83491 |
| 2024 | 16863583 | 1713878 | 920750 | 489853 | 462499 | 256391 | 101443 |
| 2025 | 16863583 | 3298840 | 647746 | 479716 | 286375 | 255941 | 217219 |