| Table 3. Estimated stock numbers at age. | |||||||||
| Year Age | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| 1978 | 29270308 | 8211674 | 1684688 | 785895 | 230920 | 19558 | 13145 | 3496 | 1234 |
| 1979 | 21099723 | 9410637 | 2106943 | 602923 | 263576 | 69413 | 5883 | 3891 | 1823 |
| 1980 | 9954313 | 6724042 | 2361465 | 756392 | 192122 | 81732 | 19197 | 1825 | 2411 |
| 1981 | 8842633 | 2933905 | 1914570 | 841949 | 241200 | 55458 | 20121 | 5689 | 1680 |
| 1982 | 7231712 | 2676128 | 743794 | 769753 | 274755 | 67997 | 13609 | 5185 | 2820 |
| 1983 | 10851222 | 2126115 | 650714 | 285854 | 279869 | 88531 | 18264 | 3908 | 3693 |
| 1984 | 10166308 | 3347620 | 524770 | 240862 | 89969 | 87975 | 23401 | 5504 | 3286 |
| 1985 | 18831138 | 2985929 | 875294 | 194919 | 72600 | 24751 | 23313 | 6012 | 3466 |
| 1986 | 17175369 | 5976012 | 762834 | 349345 | 66780 | 21988 | 5907 | 6586 | 3093 |
| 1987 | 14862764 | 5308054 | 1569917 | 275112 | 121223 | 17346 | 5310 | 1462 | 3207 |
| 1988 | 20077400 | 4466971 | 1578195 | 567065 | 91916 | 35430 | 4059 | 1404 | 1721 |
| 1989 | 11422421 | 6446816 | 1108427 | 629692 | 190776 | 27122 | 9767 | 1266 | 1825 |
| 1990 | 10486571 | 3376931 | 1905522 | 408567 | 224036 | 59716 | 6768 | 3273 | 1592 |
| 1991 | 12491913 | 3077766 | 899576 | 767657 | 132240 | 71313 | 19130 | 2429 | 2448 |
| 1992 | 14553840 | 3605748 | 915937 | 343669 | 317007 | 41139 | 21906 | 8672 | 1976 |
| 1993 | 14942858 | 4104488 | 926188 | 372181 | 133178 | 113207 | 12639 | 7760 | 6327 |
| 1994 | 13056302 | 4065003 | 1101174 | 356583 | 129562 | 45725 | 37059 | 4614 | 5653 |
| 1995 | 9895089 | 3350801 | 1093063 | 442762 | 127383 | 42749 | 14164 | 14254 | 4845 |
| 1996 | 7938188 | 2316252 | 902715 | 449784 | 171745 | 45016 | 14989 | 5499 | 10880 |
| 1997 | 12455944 | 1756957 | 589625 | 392953 | 172517 | 66934 | 16389 | 6123 | 7951 |
| 1998 | 21950297 | 2653785 | 445037 | 251283 | 162853 | 67879 | 26426 | 7402 | 7260 |
| 1999 | 23586959 | 4450201 | 684616 | 187958 | 113285 | 65774 | 28286 | 10975 | 7571 |
| 2000 | 16818828 | 4375350 | 1154341 | 284448 | 82731 | 45886 | 25939 | 12915 | 9574 |
| 2001 | 13855505 | 2889844 | 1184249 | 465603 | 120078 | 32819 | 19438 | 11145 | 13675 |
| 2002 | 7579434 | 2247683 | 787739 | 595507 | 210556 | 51591 | 13098 | 9040 | 11038 |
| 2003 | 7547232 | 1130406 | 584596 | 389836 | 297351 | 99755 | 23637 | 6054 | 10389 |
| 2004 | 8318380 | 1107487 | 261763 | 261951 | 198772 | 136624 | 50791 | 11834 | 7806 |
| 2005 | 8484912 | 1172271 | 281982 | 109013 | 129140 | 101909 | 66703 | 25788 | 11432 |
| 2006 | 6447522 | 1181416 | 316421 | 117713 | 52307 | 68446 | 52813 | 31919 | 19891 |
| 2007 | 9555603 | 839595 | 302867 | 146455 | 52599 | 24904 | 35633 | 25501 | 28316 |
| 2008 | 10007659 | 1263134 | 219563 | 136792 | 67350 | 23374 | 11491 | 17709 | 32020 |
| 2009 | 9740580 | 1344427 | 334799 | 91491 | 58933 | 32703 | 10773 | 5415 | 25007 |
| 2010 | 9436522 | 1276252 | 397953 | 137019 | 43667 | 28408 | 14971 | 4646 | 16278 |
| 2011 | 6511596 | 1244159 | 395778 | 177296 | 65460 | 20642 | 12153 | 6358 | 11221 |
| 2012 | 5432930 | 844091 | 398156 | 170571 | 86977 | 31332 | 9241 | 5276 | 11031 |
| 2013 | 9620886 | 681266 | 230659 | 197522 | 84458 | 37932 | 13496 | 4012 | 9201 |
| 2014 | 10860686 | 1284709 | 214162 | 110806 | 99155 | 39133 | 15782 | 6240 | 8184 |
| 2015 | 9742847 | 1406967 | 416282 | 90979 | 55207 | 46451 | 16470 | 6890 | 8645 |
| 2016 | 11259243 | 1306092 | 426991 | 172849 | 42769 | 23984 | 18617 | 7417 | 8442 |
| 2017 | 6917705 | 1614791 | 425444 | 173121 | 71335 | 18485 | 9158 | 8067 | 8270 |
| 2018 | 10481831 | 987853 | 522016 | 181359 | 74752 | 28599 | 7058 | 4135 | 7164 |
| 2019 | 20821676 | 1635304 | 333995 | 232147 | 85003 | 31181 | 10712 | 3303 | 4618 |
| 2020 | 19293262 | 3588556 | 504731 | 163780 | 109909 | 35513 | 12989 | 4782 | 3282 |
| 2021 | 9150606 | 3500702 | 1265560 | 224101 | 84841 | 48097 | 16348 | 6857 | 3177 |
| 2022 | 11087151 | 1616348 | 1258491 | 651136 | 114563 | 41634 | 23501 | 8985 | 5993 |
| 2023 | 7781053 | 2214575 | 596818 | 655125 | 378918 | 58228 | 20529 | 14081 | 8593 |
| 2024 | 13808969 | 1463523 | 743147 | 305637 | 408294 | 216753 | 29784 | 11788 | 14523 |
| 2025 | 13808969 | 2736426 | 529553 | 366649 | 170552 | 228387 | 121675 | 18893 | 17992 |