| Table 3. Estimated stock numbers at age. | |||||||||||
| Year Age | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 |
| 1950 | 176200 | 117804 | 79508 | 37627 | 46933 | 16663 | 4899 | 2699 | 1381 | 1463 | 2064 |
| 1951 | 505338 | 82210 | 52054 | 27816 | 12724 | 12518 | 5422 | 1975 | 1029 | 443 | 1085 |
| 1952 | 160334 | 369069 | 41538 | 20470 | 8973 | 4373 | 3848 | 1633 | 770 | 369 | 508 |
| 1953 | 706786 | 79891 | 191882 | 16498 | 6484 | 2670 | 1352 | 1049 | 540 | 273 | 327 |
| 1954 | 183542 | 627336 | 36746 | 84044 | 7394 | 2384 | 1118 | 567 | 386 | 201 | 248 |
| 1955 | 129086 | 106821 | 493808 | 17087 | 50093 | 3202 | 916 | 457 | 242 | 157 | 171 |
| 1956 | 231751 | 72730 | 61011 | 286839 | 7614 | 17436 | 1475 | 397 | 217 | 117 | 154 |
| 1957 | 125542 | 145067 | 38357 | 35706 | 106563 | 3220 | 6063 | 732 | 166 | 103 | 138 |
| 1958 | 149522 | 70244 | 86755 | 17651 | 20358 | 39413 | 1689 | 2450 | 365 | 83 | 128 |
| 1959 | 356868 | 82898 | 36577 | 37400 | 7553 | 7122 | 14696 | 753 | 871 | 152 | 92 |
| 1960 | 327907 | 250951 | 46301 | 18218 | 16251 | 3509 | 3618 | 6062 | 376 | 350 | 111 |
| 1961 | 199522 | 196613 | 142827 | 19983 | 7422 | 7864 | 1614 | 1484 | 2776 | 161 | 196 |
| 1962 | 304884 | 107685 | 96751 | 59189 | 7100 | 2821 | 3253 | 671 | 604 | 1163 | 137 |
| 1963 | 312229 | 179381 | 46210 | 27612 | 17643 | 2795 | 1132 | 1223 | 285 | 245 | 547 |
| 1964 | 336815 | 194976 | 79207 | 14104 | 7801 | 5905 | 1296 | 455 | 510 | 132 | 359 |
| 1965 | 187893 | 229018 | 112610 | 30714 | 4381 | 2805 | 2267 | 559 | 208 | 219 | 225 |
| 1966 | 301396 | 107843 | 152602 | 60455 | 12281 | 1742 | 1273 | 929 | 286 | 94 | 189 |
| 1967 | 312521 | 188120 | 51446 | 68936 | 24493 | 4892 | 806 | 605 | 450 | 142 | 136 |
| 1968 | 86343 | 218682 | 108211 | 23049 | 35014 | 12408 | 2337 | 415 | 315 | 232 | 145 |
| 1969 | 83698 | 42805 | 119533 | 48995 | 10512 | 15324 | 5652 | 1155 | 197 | 157 | 176 |
| 1970 | 230296 | 41547 | 19232 | 58223 | 22541 | 5732 | 7729 | 2904 | 633 | 105 | 185 |
| 1971 | 195527 | 136026 | 18393 | 7785 | 28574 | 11165 | 3209 | 4314 | 1605 | 360 | 157 |
| 1972 | 833872 | 111006 | 81954 | 7559 | 3956 | 16064 | 6259 | 1897 | 2625 | 953 | 295 |
| 1973 | 333509 | 511860 | 55307 | 23264 | 2198 | 1875 | 7356 | 2789 | 893 | 1351 | 579 |
| 1974 | 130183 | 171048 | 224496 | 18043 | 10469 | 1070 | 1195 | 4382 | 1643 | 535 | 1213 |
| 1975 | 122895 | 61819 | 90428 | 126210 | 6840 | 4882 | 513 | 643 | 2102 | 791 | 927 |
| 1976 | 129385 | 58812 | 25543 | 42744 | 76575 | 3151 | 2754 | 277 | 384 | 1130 | 960 |
| 1977 | 191484 | 52940 | 22545 | 8523 | 16829 | 30120 | 1284 | 1186 | 114 | 173 | 792 |
| 1978 | 241858 | 73176 | 17637 | 6446 | 3283 | 7536 | 15014 | 630 | 564 | 48 | 430 |
| 1979 | 193916 | 117185 | 29868 | 4839 | 2350 | 1499 | 4013 | 6975 | 340 | 269 | 222 |
| 1980 | 97498 | 103291 | 56434 | 9378 | 1319 | 1150 | 749 | 2136 | 3429 | 177 | 233 |
| 1981 | 71965 | 44657 | 57762 | 23560 | 3348 | 587 | 592 | 391 | 1121 | 1667 | 210 |
| 1982 | 46817 | 31465 | 20675 | 26697 | 9047 | 1618 | 286 | 319 | 225 | 612 | 912 |
| 1983 | 11473 | 20374 | 13050 | 8856 | 11043 | 4896 | 910 | 143 | 178 | 128 | 741 |
| 1984 | 14834 | 4771 | 7486 | 4072 | 4153 | 7571 | 2549 | 519 | 73 | 99 | 467 |
| 1985 | 251371 | 8508 | 2576 | 3674 | 2324 | 2719 | 4955 | 1709 | 341 | 48 | 373 |
| 1986 | 524869 | 202782 | 4808 | 1424 | 1885 | 1215 | 1560 | 2689 | 989 | 196 | 256 |
| 1987 | 84978 | 280086 | 128872 | 2304 | 584 | 804 | 549 | 709 | 1168 | 457 | 202 |
| 1988 | 42479 | 61776 | 134952 | 43448 | 1033 | 219 | 326 | 240 | 324 | 504 | 277 |
| 1989 | 27443 | 27194 | 46483 | 70271 | 12937 | 561 | 89 | 155 | 115 | 157 | 362 |
| 1990 | 32901 | 19089 | 16991 | 25377 | 33114 | 5620 | 372 | 56 | 89 | 66 | 277 |
| 1991 | 103410 | 23411 | 12836 | 14053 | 20366 | 20223 | 3118 | 262 | 38 | 58 | 205 |
| 1992 | 285787 | 77587 | 14966 | 10046 | 10616 | 12614 | 12534 | 1859 | 174 | 25 | 156 |
| 1993 | 750107 | 198420 | 54698 | 10234 | 5977 | 6319 | 7583 | 7164 | 1027 | 108 | 105 |
| 1994 | 390010 | 543133 | 139351 | 30495 | 4618 | 3144 | 3767 | 4729 | 4254 | 579 | 118 |
| 1995 | 96945 | 220798 | 415263 | 73363 | 14453 | 2062 | 1420 | 1882 | 2165 | 2122 | 335 |
| 1996 | 83316 | 59401 | 162443 | 238004 | 32023 | 7142 | 1056 | 689 | 919 | 1063 | 1226 |
| 1997 | 115139 | 59042 | 37988 | 93526 | 103821 | 14042 | 2447 | 487 | 306 | 410 | 1076 |
| 1998 | 67018 | 82587 | 35431 | 18090 | 37665 | 38770 | 5241 | 967 | 210 | 130 | 718 |
| 1999 | 146512 | 48846 | 47099 | 17653 | 9013 | 15953 | 13726 | 1891 | 404 | 95 | 403 |
| 2000 | 85528 | 114524 | 31460 | 21883 | 7176 | 4342 | 6583 | 5348 | 801 | 189 | 248 |
| 2001 | 352727 | 68534 | 90921 | 17179 | 10415 | 3513 | 2594 | 3464 | 2587 | 427 | 248 |
| 2002 | 387766 | 286154 | 51808 | 46983 | 9379 | 5515 | 1868 | 1450 | 1903 | 1356 | 353 |
| 2003 | 336678 | 256260 | 187750 | 34574 | 24292 | 4585 | 3503 | 1230 | 827 | 1072 | 968 |
| 2004 | 254365 | 169589 | 162308 | 108587 | 16473 | 10576 | 2128 | 1663 | 622 | 390 | 1057 |
| 2005 | 354665 | 170983 | 95697 | 107965 | 50437 | 6566 | 5400 | 1143 | 718 | 313 | 793 |
| 2006 | 158498 | 215847 | 106333 | 53419 | 46131 | 20829 | 3188 | 2788 | 563 | 340 | 544 |
| 2007 | 514050 | 120956 | 160759 | 60025 | 27660 | 19522 | 8227 | 1786 | 1491 | 295 | 453 |
| 2008 | 1090881 | 454304 | 96652 | 99546 | 22437 | 14872 | 7128 | 3303 | 936 | 739 | 378 |
| 2009 | 1025456 | 705922 | 363305 | 61251 | 40791 | 10402 | 5328 | 3100 | 1436 | 532 | 630 |
| 2010 | 253212 | 680184 | 601013 | 232122 | 32639 | 15044 | 4834 | 2733 | 1588 | 776 | 717 |
| 2011 | 136599 | 206048 | 561251 | 414484 | 122061 | 13911 | 6148 | 2096 | 1334 | 816 | 886 |
| 2012 | 335363 | 77919 | 138873 | 382780 | 260622 | 55023 | 5999 | 2476 | 1002 | 685 | 974 |
| 2013 | 117821 | 201936 | 62623 | 96381 | 268130 | 125313 | 23803 | 3100 | 1367 | 578 | 1017 |
| 2014 | 396296 | 71800 | 140176 | 49620 | 88009 | 144533 | 62393 | 10756 | 1824 | 858 | 1010 |
| 2015 | 75859 | 270342 | 65515 | 90005 | 40252 | 68304 | 73266 | 25721 | 5312 | 1000 | 1028 |
| 2016 | 210693 | 53253 | 169158 | 46862 | 61790 | 33227 | 49568 | 37929 | 12801 | 2521 | 980 |
| 2017 | 195115 | 172527 | 36352 | 110627 | 28541 | 36311 | 18562 | 21735 | 17866 | 5550 | 1423 |
| 2018 | 349586 | 129653 | 116383 | 24420 | 44542 | 14576 | 17582 | 8793 | 9121 | 8436 | 3047 |
| 2019 | 783507 | 231928 | 84191 | 58985 | 16225 | 17284 | 6916 | 7511 | 3634 | 3825 | 4157 |
| 2020 | 423483 | 498088 | 148788 | 43956 | 21967 | 8422 | 6977 | 3416 | 3143 | 1732 | 3241 |
| 2021 | 160211 | 257512 | 330978 | 65449 | 17935 | 7737 | 3789 | 2783 | 1603 | 1426 | 2125 |
| 2022 | 45401 | 138639 | 178411 | 158963 | 26415 | 6162 | 2800 | 1515 | 1087 | 690 | 1420 |
| 2023 | 171341 | 35606 | 105915 | 111145 | 69316 | 9372 | 2467 | 1155 | 672 | 511 | 947 |
| 2024 | 434994 | 104638 | 29940 | 62680 | 53604 | 28266 | 3584 | 1082 | 516 | 325 | 685 |
| 2025 | 492095 | 274673 | 63383 | 21175 | 34708 | 28571 | 12177 | 1565 | 490 | 244 | 482 |
| 2026 | 288504 | 323332 | 188954 | 33630 | 14305 | 17648 | 14358 | 6044 | 812 | 256 | 378 |