| Table 3. Estimated stock numbers at age. | |||||||||
| Year Age | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| 1957 | 1650111 | 2078968 | 589318 | 292836 | 251723 | 122583 | 60709 | 9549 | 32264 |
| 1958 | 2969186 | 766415 | 1360646 | 352535 | 187567 | 150205 | 71745 | 36225 | 25515 |
| 1959 | 4664825 | 1408573 | 507172 | 831827 | 203927 | 114720 | 81648 | 35912 | 31657 |
| 1960 | 1300576 | 2127496 | 934081 | 341221 | 483199 | 118504 | 70790 | 42747 | 33833 |
| 1961 | 2446290 | 615479 | 1306686 | 625055 | 241997 | 292005 | 74373 | 45011 | 42665 |
| 1962 | 3903433 | 1169432 | 366231 | 827208 | 433544 | 166991 | 198779 | 49413 | 56967 |
| 1963 | 2674981 | 1774982 | 726981 | 220406 | 514011 | 288748 | 106809 | 124962 | 65288 |
| 1964 | 2057448 | 1388442 | 1125438 | 446883 | 141738 | 328843 | 193287 | 70508 | 123640 |
| 1965 | 11579713 | 863485 | 958384 | 713583 | 280335 | 95665 | 210824 | 125893 | 124506 |
| 1966 | 2666117 | 5757838 | 574276 | 653072 | 437598 | 175384 | 66586 | 126879 | 151945 |
| 1967 | 4810781 | 928925 | 3810014 | 385007 | 430129 | 275285 | 103955 | 41254 | 157833 |
| 1968 | 6055698 | 2039446 | 528148 | 2639752 | 248253 | 287422 | 169185 | 60048 | 110683 |
| 1969 | 3098681 | 2627172 | 1238081 | 324229 | 1811221 | 169168 | 194885 | 108001 | 106101 |
| 1970 | 4910903 | 1459617 | 1694988 | 766456 | 199958 | 1161204 | 106211 | 112606 | 113451 |
| 1971 | 7305957 | 2054671 | 927498 | 968537 | 429686 | 116128 | 705007 | 59257 | 116717 |
| 1972 | 4505303 | 3661886 | 1067564 | 432892 | 456653 | 215431 | 60024 | 371922 | 83896 |
| 1973 | 1716463 | 1707564 | 2298029 | 540825 | 237114 | 248781 | 121573 | 31988 | 244854 |
| 1974 | 2702591 | 754161 | 826888 | 1206973 | 259534 | 119478 | 123571 | 64946 | 135536 |
| 1975 | 2725398 | 1050257 | 382931 | 345879 | 509332 | 102058 | 45012 | 49754 | 80513 |
| 1976 | 1738586 | 1158616 | 476758 | 183841 | 152435 | 209321 | 37542 | 16424 | 45767 |
| 1977 | 1688557 | 733444 | 537980 | 204261 | 86431 | 66604 | 77840 | 13250 | 19642 |
| 1978 | 2497645 | 742714 | 413023 | 276627 | 105531 | 47600 | 32448 | 35356 | 14650 |
| 1979 | 1952933 | 1161056 | 422288 | 251196 | 146623 | 60113 | 28145 | 17891 | 23716 |
| 1980 | 1563162 | 967822 | 763229 | 274818 | 166390 | 92848 | 35805 | 17229 | 23365 |
| 1981 | 2829233 | 735282 | 690923 | 486124 | 175629 | 104126 | 61187 | 19562 | 22105 |
| 1982 | 1763957 | 1283351 | 426272 | 414375 | 269946 | 99415 | 54887 | 34193 | 20048 |
| 1983 | 5423293 | 799400 | 666653 | 221729 | 217920 | 133264 | 47708 | 24848 | 22854 |
| 1984 | 1849511 | 2585621 | 440975 | 319949 | 111148 | 103854 | 57790 | 18564 | 16297 |
| 1985 | 3724199 | 918672 | 1594612 | 245432 | 174238 | 62876 | 55671 | 28617 | 14839 |
| 1986 | 3146950 | 1600583 | 604280 | 955425 | 144107 | 97754 | 34291 | 28245 | 19383 |
| 1987 | 4916345 | 1328127 | 879428 | 365436 | 549086 | 78345 | 49878 | 18026 | 24721 |
| 1988 | 1224742 | 2448105 | 755468 | 475217 | 214330 | 283979 | 36644 | 20129 | 15768 |
| 1989 | 1568150 | 625039 | 1659406 | 427499 | 266060 | 128377 | 150647 | 18521 | 17405 |
| 1990 | 1514242 | 717816 | 429715 | 1073755 | 246749 | 147874 | 76226 | 75096 | 16483 |
| 1991 | 1405702 | 665373 | 434073 | 276519 | 622368 | 129848 | 73985 | 37495 | 35664 |
| 1992 | 1278878 | 553464 | 401059 | 269261 | 182384 | 358372 | 66714 | 35298 | 30675 |
| 1993 | 1284904 | 627776 | 300895 | 240163 | 166471 | 118840 | 199976 | 35344 | 30135 |
| 1994 | 2088111 | 621696 | 356058 | 156007 | 130593 | 94754 | 68704 | 95644 | 30029 |
| 1995 | 892130 | 1017279 | 364189 | 193861 | 88877 | 72004 | 53160 | 37351 | 55527 |
| 1996 | 1688743 | 518218 | 575938 | 203450 | 102551 | 50296 | 37668 | 29462 | 45993 |
| 1997 | 1890228 | 826225 | 344366 | 290690 | 107926 | 54262 | 24763 | 16856 | 26720 |
| 1998 | 1451762 | 941428 | 486905 | 206727 | 142144 | 52181 | 23817 | 9409 | 15382 |
| 1999 | 1329908 | 612102 | 610945 | 260213 | 108107 | 63903 | 23217 | 9763 | 10297 |
| 2000 | 2467258 | 519072 | 320876 | 349710 | 140182 | 59680 | 33338 | 12092 | 10630 |
| 2001 | 1695016 | 1189780 | 260767 | 166727 | 196875 | 79874 | 32825 | 18151 | 11167 |
| 2002 | 2145685 | 798669 | 729702 | 130906 | 91405 | 107025 | 43288 | 15948 | 13606 |
| 2003 | 1322989 | 1003384 | 518598 | 420078 | 66871 | 48048 | 53611 | 23196 | 14085 |
| 2004 | 1342445 | 580433 | 627387 | 324513 | 239627 | 35103 | 28550 | 27057 | 18691 |
| 2005 | 1071999 | 566312 | 358670 | 385240 | 199710 | 129354 | 17881 | 14955 | 20532 |
| 2006 | 891270 | 506808 | 314740 | 212390 | 248718 | 137561 | 82928 | 11330 | 21533 |
| 2007 | 514152 | 425400 | 306252 | 159555 | 114779 | 136095 | 76138 | 42654 | 15786 |
| 2008 | 608603 | 250752 | 253754 | 167712 | 82634 | 61463 | 76052 | 39638 | 31424 |
| 2009 | 821919 | 298283 | 159742 | 148005 | 92279 | 47295 | 36281 | 44094 | 40390 |
| 2010 | 1887143 | 352376 | 186476 | 91720 | 80191 | 45618 | 25380 | 19319 | 44460 |
| 2011 | 696001 | 784809 | 200367 | 103830 | 51457 | 40345 | 20619 | 12417 | 30631 |
| 2012 | 1259387 | 324509 | 464633 | 109541 | 55669 | 28816 | 20385 | 9044 | 20629 |
| 2013 | 376267 | 472540 | 212795 | 275608 | 60957 | 29055 | 15508 | 10335 | 14010 |
| 2014 | 508996 | 188965 | 256760 | 138061 | 148077 | 30237 | 12161 | 6206 | 7401 |
| 2015 | 866136 | 246851 | 124401 | 138443 | 79009 | 62617 | 11823 | 4140 | 3198 |
| 2016 | 364211 | 412786 | 164592 | 74037 | 68650 | 37874 | 21719 | 3892 | 2071 |
| 2017 | 336278 | 159476 | 302730 | 115374 | 48454 | 38642 | 20872 | 10469 | 3047 |
| 2018 | 274210 | 159723 | 109205 | 198597 | 75803 | 30658 | 21450 | 11659 | 7038 |
| 2019 | 2265254 | 129696 | 101113 | 71565 | 123346 | 45767 | 17797 | 12680 | 9970 |