| Table 3. Estimated stock numbers at age. | ||||||||||
| Year Age | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| 1957 | 448810 | 260011 | 351522 | 213687 | 146191 | 52635 | 63414 | 53039 | 31947 | 69907 |
| 1958 | 747034 | 378969 | 190049 | 253065 | 145810 | 94684 | 41345 | 45324 | 37013 | 75944 |
| 1959 | 1054579 | 597086 | 277244 | 128933 | 165449 | 95098 | 63746 | 31543 | 33266 | 82029 |
| 1960 | 823901 | 759600 | 397681 | 184420 | 81596 | 105825 | 63526 | 43589 | 24143 | 79402 |
| 1961 | 894566 | 651675 | 480554 | 256543 | 120687 | 53602 | 67115 | 44468 | 30813 | 74264 |
| 1962 | 656544 | 750033 | 447481 | 306278 | 168681 | 76559 | 38523 | 45487 | 29533 | 72324 |
| 1963 | 944033 | 537862 | 499469 | 289549 | 191545 | 106527 | 49164 | 28616 | 33644 | 78914 |
| 1964 | 1198652 | 679666 | 347873 | 301016 | 182663 | 121714 | 63569 | 30673 | 19671 | 83500 |
| 1965 | 655887 | 1531390 | 388927 | 204871 | 165735 | 106930 | 75148 | 41330 | 20882 | 79447 |
| 1966 | 510604 | 604159 | 1276107 | 228068 | 127543 | 103137 | 64051 | 50108 | 29832 | 69826 |
| 1967 | 290928 | 485491 | 396937 | 866021 | 134579 | 78030 | 69568 | 38526 | 35289 | 64404 |
| 1968 | 563119 | 295152 | 318905 | 239007 | 558869 | 73662 | 46905 | 51612 | 24325 | 74864 |
| 1969 | 705082 | 369535 | 223711 | 207683 | 150958 | 386705 | 46805 | 30587 | 39672 | 76886 |
| 1970 | 743075 | 549490 | 236810 | 160279 | 139836 | 107550 | 253173 | 31583 | 20508 | 76943 |
| 1971 | 480598 | 524575 | 321163 | 129579 | 93191 | 85327 | 67782 | 140639 | 25862 | 73852 |
| 1972 | 456382 | 347122 | 341820 | 194283 | 78642 | 57742 | 56340 | 44017 | 88227 | 69250 |
| 1973 | 985750 | 302572 | 211721 | 216968 | 119533 | 46718 | 35059 | 37374 | 27779 | 105178 |
| 1974 | 1071050 | 927938 | 175903 | 121613 | 118347 | 64362 | 28821 | 23042 | 23273 | 87883 |
| 1975 | 904174 | 788633 | 620199 | 92965 | 65146 | 60901 | 38300 | 19029 | 14838 | 70717 |
| 1976 | 751149 | 544146 | 429784 | 340110 | 45298 | 32155 | 31171 | 23235 | 11524 | 49892 |
| 1977 | 1008680 | 458596 | 319915 | 258755 | 215178 | 28080 | 19666 | 17829 | 15220 | 37002 |
| 1978 | 968327 | 650589 | 244707 | 175230 | 144238 | 108253 | 18435 | 12527 | 10478 | 32302 |
| 1979 | 999001 | 643421 | 382341 | 141081 | 102405 | 89690 | 61719 | 12163 | 8794 | 29755 |
| 1980 | 1097732 | 570345 | 308733 | 183039 | 65665 | 50416 | 44824 | 31455 | 7335 | 23122 |
| 1981 | 790459 | 812243 | 309508 | 142515 | 90486 | 35887 | 29312 | 27014 | 19476 | 21847 |
| 1982 | 1884364 | 617267 | 466298 | 156594 | 68310 | 45968 | 21909 | 17462 | 16227 | 28754 |
| 1983 | 1300487 | 1406972 | 339832 | 218930 | 72589 | 34060 | 25518 | 13550 | 10474 | 28258 |
| 1984 | 1372406 | 930305 | 795396 | 184256 | 98867 | 38697 | 19799 | 16179 | 8802 | 23350 |
| 1985 | 1844712 | 881849 | 489611 | 430061 | 93700 | 46054 | 21512 | 12051 | 9630 | 20543 |
| 1986 | 4552517 | 1279534 | 494432 | 283924 | 211476 | 55398 | 25439 | 12666 | 7842 | 20499 |
| 1987 | 1856662 | 3354154 | 653112 | 251654 | 148033 | 94272 | 28897 | 13679 | 7119 | 17532 |
| 1988 | 1865524 | 1397525 | 1700622 | 328486 | 123156 | 65948 | 45213 | 14285 | 8799 | 16877 |
| 1989 | 1287925 | 1382860 | 730733 | 833970 | 159435 | 54279 | 30254 | 23630 | 7545 | 16501 |
| 1990 | 1025938 | 911195 | 739422 | 384141 | 406738 | 75756 | 26185 | 16107 | 13602 | 14609 |
| 1991 | 1087282 | 832648 | 526648 | 395441 | 192245 | 187461 | 38242 | 15412 | 10017 | 18404 |
| 1992 | 928857 | 748207 | 436324 | 267332 | 196583 | 88943 | 78105 | 20337 | 9137 | 19358 |
| 1993 | 665785 | 650680 | 392577 | 218686 | 133620 | 85813 | 38644 | 34622 | 11490 | 17528 |
| 1994 | 529662 | 436436 | 356932 | 203197 | 111106 | 63302 | 41008 | 19979 | 18297 | 17044 |
| 1995 | 1134904 | 368264 | 235678 | 184417 | 99589 | 56322 | 33723 | 18944 | 10611 | 17765 |
| 1996 | 1155259 | 968608 | 218308 | 119906 | 84856 | 45159 | 29159 | 17708 | 10247 | 18581 |
| 1997 | 1596718 | 1023867 | 500280 | 106109 | 58353 | 40070 | 22236 | 16096 | 10664 | 17331 |
| 1998 | 922731 | 1681571 | 517607 | 203125 | 51679 | 24692 | 18636 | 12320 | 9465 | 16881 |
| 1999 | 1022207 | 648454 | 1000944 | 204075 | 76327 | 29592 | 13259 | 11320 | 8275 | 17235 |
| 2000 | 1054052 | 693426 | 339882 | 527038 | 75209 | 35681 | 14195 | 8360 | 7126 | 16961 |
| 2001 | 465330 | 836086 | 444201 | 239223 | 312300 | 37501 | 19387 | 8571 | 6063 | 18155 |
| 2002 | 1937080 | 447203 | 367400 | 190488 | 118859 | 145446 | 22568 | 13400 | 6878 | 15795 |
| 2003 | 594583 | 1409592 | 256651 | 189896 | 104956 | 64656 | 94011 | 13558 | 9455 | 13427 |
| 2004 | 1378119 | 483252 | 724804 | 138482 | 104925 | 60937 | 36941 | 58991 | 9379 | 13944 |
| 2005 | 820027 | 1005621 | 253893 | 399008 | 83018 | 81898 | 40163 | 28247 | 47480 | 16320 |
| 2006 | 1224270 | 701047 | 596026 | 168616 | 257602 | 51932 | 61500 | 27368 | 25930 | 41535 |
| 2007 | 1084343 | 846575 | 441578 | 371373 | 118693 | 208847 | 41980 | 55645 | 19208 | 48314 |
| 2008 | 1330781 | 1098648 | 498247 | 300761 | 268167 | 83045 | 194585 | 39995 | 42209 | 47988 |
| 2009 | 1518061 | 1025701 | 780939 | 336395 | 209432 | 217016 | 64991 | 167940 | 32966 | 57977 |
| 2010 | 1611541 | 1063111 | 706858 | 600095 | 239816 | 154648 | 203634 | 58182 | 131542 | 71244 |
| 2011 | 1662755 | 1190903 | 714646 | 563306 | 463879 | 188062 | 118101 | 195484 | 49126 | 135716 |
| 2012 | 1207233 | 1635736 | 1003891 | 550272 | 403500 | 335714 | 140615 | 101537 | 163040 | 117991 |
| 2013 | 1549135 | 1059341 | 1172560 | 705658 | 373402 | 299176 | 243105 | 111841 | 94538 | 189847 |
| 2014 | 2429403 | 1275734 | 905218 | 856328 | 522652 | 266781 | 224656 | 193372 | 105928 | 184921 |
| 2015 | 1058568 | 1760669 | 1060980 | 727339 | 605368 | 388885 | 217081 | 197707 | 159899 | 211231 |
| 2016 | 1143823 | 883166 | 1130199 | 804172 | 559446 | 440666 | 308192 | 193182 | 174830 | 232594 |
| 2017 | 1747975 | 1023025 | 655967 | 803348 | 566160 | 416022 | 324079 | 270868 | 157287 | 235664 |
| 2018 | 843832 | 1577816 | 809044 | 497453 | 551079 | 429978 | 328039 | 279402 | 279648 | 286660 |