| Table 3. Estimated stock numbers at age. | |||||||||
| Year Age | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| 1957 | 1464423 | 735197 | 978054 | 600208 | 418724 | 157068 | 193940 | 170576 | 297859 |
| 1958 | 2116011 | 1046977 | 504977 | 674830 | 402267 | 271437 | 113267 | 132858 | 323033 |
| 1959 | 2495138 | 1519843 | 718804 | 335871 | 443793 | 264836 | 180423 | 78101 | 313396 |
| 1960 | 2206410 | 1769469 | 992778 | 472811 | 216313 | 289760 | 176385 | 121437 | 266799 |
| 1961 | 2362424 | 1562119 | 1140205 | 638588 | 310264 | 142940 | 186868 | 119525 | 263898 |
| 1962 | 1696676 | 1705770 | 1036570 | 728347 | 415824 | 199437 | 97675 | 124486 | 258622 |
| 1963 | 1978419 | 1195153 | 1104454 | 670354 | 463246 | 266104 | 130084 | 66463 | 263390 |
| 1964 | 5119634 | 1356906 | 756994 | 674751 | 430870 | 300574 | 164341 | 84554 | 224399 |
| 1965 | 1939961 | 4005024 | 821896 | 463620 | 395012 | 268333 | 192084 | 107036 | 210680 |
| 1966 | 1516888 | 1371829 | 2881476 | 498749 | 294347 | 249045 | 169194 | 125975 | 214215 |
| 1967 | 1016026 | 1095202 | 860291 | 1917009 | 300758 | 184610 | 162368 | 108815 | 224351 |
| 1968 | 1024588 | 727476 | 694935 | 526551 | 1260869 | 173623 | 114967 | 108264 | 222441 |
| 1969 | 1466798 | 699033 | 481643 | 438821 | 329789 | 857382 | 108423 | 75115 | 225173 |
| 1970 | 1354559 | 1031696 | 439969 | 312151 | 279474 | 220149 | 554906 | 69171 | 197446 |
| 1971 | 882151 | 961507 | 604510 | 250245 | 184472 | 172196 | 138526 | 338490 | 175009 |
| 1972 | 776102 | 608330 | 611838 | 361763 | 150852 | 113098 | 109983 | 88590 | 326453 |
| 1973 | 2611826 | 506334 | 364613 | 379151 | 220057 | 90198 | 67840 | 70021 | 262734 |
| 1974 | 2008702 | 1835720 | 297105 | 211424 | 214693 | 123725 | 54753 | 42382 | 208961 |
| 1975 | 1416797 | 1376982 | 1123125 | 163602 | 118694 | 118280 | 74003 | 34040 | 156207 |
| 1976 | 1152490 | 924668 | 775378 | 629039 | 86609 | 63651 | 65966 | 44407 | 114943 |
| 1977 | 1657173 | 744611 | 545710 | 454679 | 382987 | 53017 | 37841 | 39904 | 98042 |
| 1978 | 1484483 | 1085351 | 408686 | 303171 | 258272 | 205236 | 33363 | 22892 | 83513 |
| 1979 | 1442597 | 982771 | 613851 | 231049 | 174623 | 156790 | 119396 | 20499 | 66115 |
| 1980 | 2090736 | 890184 | 489352 | 305513 | 115385 | 92013 | 83881 | 66869 | 50903 |
| 1981 | 1654009 | 1354553 | 488912 | 237919 | 156946 | 64557 | 53796 | 50244 | 72298 |
| 1982 | 3583252 | 1065174 | 741276 | 255839 | 119177 | 82520 | 38540 | 31964 | 75642 |
| 1983 | 2398220 | 2367006 | 571693 | 361711 | 127515 | 62067 | 45885 | 22673 | 65389 |
| 1984 | 2275632 | 1537372 | 1301536 | 309402 | 170423 | 68940 | 35147 | 27409 | 53699 |
| 1985 | 2884230 | 1429611 | 807924 | 693325 | 162624 | 83089 | 38593 | 20508 | 49387 |
| 1986 | 7444797 | 1926403 | 778743 | 450510 | 345039 | 93926 | 44764 | 22444 | 43006 |
| 1987 | 3369271 | 5027689 | 992121 | 390722 | 232848 | 161511 | 50043 | 24279 | 38222 |
| 1988 | 3343313 | 2190687 | 2535273 | 495036 | 190570 | 110258 | 81007 | 26056 | 36509 |
| 1989 | 2270971 | 2188909 | 1129431 | 1257923 | 247308 | 90380 | 55196 | 44211 | 36321 |
| 1990 | 2007105 | 1467676 | 1165577 | 593434 | 635898 | 127274 | 46991 | 31016 | 47788 |
| 1991 | 1901203 | 1360964 | 830980 | 622828 | 306877 | 315260 | 69523 | 27257 | 48070 |
| 1992 | 1656379 | 1217448 | 716756 | 435943 | 322262 | 155122 | 151718 | 38976 | 45604 |
| 1993 | 1058824 | 1077096 | 654870 | 374251 | 231494 | 159682 | 78802 | 80282 | 50146 |
| 1994 | 922156 | 688658 | 595109 | 349657 | 200215 | 121670 | 86388 | 44507 | 74558 |
| 1995 | 1962762 | 592123 | 381259 | 314400 | 182224 | 108550 | 68669 | 47695 | 66503 |
| 1996 | 2241509 | 1358911 | 340602 | 200395 | 157944 | 94425 | 61151 | 37911 | 64769 |
| 1997 | 4216269 | 1630531 | 722578 | 178687 | 108945 | 82337 | 52300 | 35729 | 59558 |
| 1998 | 1692818 | 2942570 | 780601 | 323956 | 95480 | 53335 | 42641 | 30077 | 55764 |
| 1999 | 1620050 | 1076947 | 1647998 | 337878 | 140688 | 56695 | 29908 | 25672 | 51972 |
| 2000 | 2007864 | 1073553 | 589607 | 924487 | 142538 | 70516 | 30495 | 18598 | 47406 |
| 2001 | 1411337 | 1375659 | 679407 | 389379 | 518646 | 75816 | 39657 | 19278 | 42862 |
| 2002 | 3997248 | 944855 | 663010 | 337291 | 209863 | 257495 | 46003 | 25262 | 39343 |
| 2003 | 1504764 | 2609259 | 516544 | 358524 | 194449 | 120203 | 162504 | 27992 | 40600 |
| 2004 | 2884252 | 983282 | 1424568 | 289149 | 207860 | 121210 | 71481 | 100743 | 44064 |
| 2005 | 2249157 | 2033259 | 533476 | 822540 | 173688 | 152826 | 82953 | 48375 | 99778 |
| 2006 | 2651391 | 1553946 | 1238665 | 345060 | 513184 | 112585 | 109287 | 56717 | 106242 |
| 2007 | 3848883 | 1843754 | 972368 | 770424 | 244138 | 370404 | 81201 | 80846 | 119465 |
| 2008 | 3364388 | 2837038 | 1113617 | 638903 | 510150 | 162347 | 290560 | 60496 | 147378 |
| 2009 | 3300369 | 2289405 | 1833129 | 697254 | 418230 | 354626 | 112170 | 208346 | 164185 |
| 2010 | 3655063 | 2255631 | 1535909 | 1213787 | 454617 | 273757 | 271878 | 82836 | 275384 |
| 2011 | 5171392 | 2608525 | 1513681 | 1108303 | 833836 | 312263 | 184446 | 200274 | 281012 |
| 2012 | 3142281 | 3811278 | 2078758 | 1066391 | 744199 | 565450 | 210676 | 132058 | 339334 |
| 2013 | 3706159 | 2392793 | 2483967 | 1370485 | 679180 | 499141 | 373559 | 146149 | 317400 |
| 2014 | 4511020 | 2733671 | 1786158 | 1599083 | 897429 | 437603 | 323109 | 251997 | 314714 |
| 2015 | 2261463 | 3140559 | 1955464 | 1255858 | 990432 | 588765 | 302472 | 224810 | 386693 |
| 2016 | 2560291 | 1636372 | 1921008 | 1305514 | 846796 | 623584 | 393002 | 213208 | 411263 |
| 2017 | 3902205 | 1858105 | 1062942 | 1213182 | 815918 | 539881 | 382192 | 261570 | 403794 |
| 2018 | 2350827 | 2840380 | 1220286 | 680691 | 738941 | 509419 | 349153 | 257456 | 445192 |
| 2019 | 5368204 | 1704054 | 1804675 | 716634 | 425179 | 450636 | 323823 | 238251 | 463930 |
| 2020 | 3810740 | 3647062 | 1144746 | 1171226 | 448622 | 280486 | 315153 | 228131 | 485565 |