| Table 3. Estimated stock numbers at age. | |||||||||
| Year Age | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| 1957 | 1697033 | 700108 | 824364 | 462294 | 300833 | 106778 | 127486 | 111057 | 191273 |
| 1958 | 2459351 | 1004229 | 430656 | 526755 | 294103 | 187614 | 75713 | 87772 | 213379 |
| 1959 | 2913917 | 1462046 | 617867 | 265090 | 328293 | 185484 | 122533 | 52185 | 210836 |
| 1960 | 2590443 | 1709840 | 857403 | 375806 | 161603 | 204781 | 120855 | 82159 | 182226 |
| 1961 | 2782285 | 1518283 | 990934 | 511536 | 233488 | 102156 | 129366 | 81569 | 182351 |
| 1962 | 2001457 | 1662099 | 907439 | 588607 | 316357 | 144257 | 68301 | 86056 | 180915 |
| 1963 | 2331830 | 1167825 | 970383 | 545736 | 356123 | 194436 | 92117 | 46199 | 185812 |
| 1964 | 6102681 | 1325593 | 667252 | 550557 | 332177 | 220838 | 117091 | 59369 | 159303 |
| 1965 | 2313296 | 3945045 | 726064 | 379752 | 306035 | 198010 | 137237 | 75556 | 150179 |
| 1966 | 1818433 | 1355513 | 2565490 | 411643 | 229924 | 185944 | 122315 | 89620 | 154074 |
| 1967 | 1227597 | 1087767 | 771394 | 1594327 | 236927 | 138984 | 118449 | 78277 | 162700 |
| 1968 | 1245479 | 729008 | 627288 | 442069 | 1002691 | 132323 | 84804 | 78409 | 162806 |
| 1969 | 1788138 | 705074 | 439471 | 372807 | 266819 | 662256 | 81471 | 55440 | 166802 |
| 1970 | 1661463 | 1043002 | 404807 | 268141 | 228935 | 173052 | 422509 | 51967 | 148565 |
| 1971 | 1085125 | 979639 | 558581 | 216597 | 151779 | 136092 | 106132 | 255463 | 132464 |
| 1972 | 956218 | 621988 | 570218 | 315573 | 125692 | 90355 | 85214 | 67371 | 248508 |
| 1973 | 3233776 | 519796 | 342140 | 333397 | 184754 | 72882 | 53168 | 53722 | 202016 |
| 1974 | 2479924 | 1891747 | 280094 | 187354 | 181704 | 100679 | 43204 | 32795 | 161642 |
| 1975 | 1751878 | 1417353 | 1062314 | 145822 | 101000 | 96825 | 58797 | 26438 | 121346 |
| 1976 | 1429925 | 956207 | 734788 | 561103 | 73978 | 52152 | 52523 | 34602 | 89269 |
| 1977 | 2062410 | 772231 | 520526 | 408758 | 328986 | 43948 | 30470 | 31538 | 76966 |
| 1978 | 1838718 | 1129458 | 391803 | 274340 | 223863 | 171482 | 26992 | 18219 | 66141 |
| 1979 | 1786484 | 1016878 | 590188 | 210507 | 152661 | 132098 | 98128 | 16416 | 52852 |
| 1980 | 2597380 | 925762 | 468486 | 277515 | 100563 | 77255 | 68548 | 53802 | 40562 |
| 1981 | 2057109 | 1408426 | 469965 | 216430 | 137035 | 54377 | 44074 | 40435 | 57952 |
| 1982 | 4463052 | 1109483 | 712447 | 233408 | 104393 | 69779 | 31663 | 25800 | 60822 |
| 1983 | 2988680 | 2467866 | 551498 | 330054 | 111729 | 52441 | 37754 | 18277 | 52606 |
| 1984 | 2841153 | 1604890 | 1256237 | 283603 | 149810 | 58326 | 28919 | 22135 | 43275 |
| 1985 | 3595745 | 1496577 | 782719 | 635814 | 143340 | 70591 | 31707 | 16518 | 39729 |
| 1986 | 9251088 | 2008690 | 755660 | 416008 | 306160 | 80079 | 37064 | 18085 | 34569 |
| 1987 | 4166638 | 5224249 | 958969 | 360280 | 206175 | 137856 | 41073 | 19475 | 30357 |
| 1988 | 4141132 | 2268414 | 2435418 | 452841 | 167521 | 92926 | 65927 | 20534 | 28419 |
| 1989 | 2821618 | 2267375 | 1079193 | 1140942 | 215138 | 75340 | 44247 | 34411 | 27717 |
| 1990 | 2492429 | 1523364 | 1113781 | 536582 | 550601 | 105417 | 37393 | 23934 | 36189 |
| 1991 | 2360686 | 1407840 | 793640 | 563582 | 265663 | 260602 | 55028 | 20857 | 36104 |
| 1992 | 2064003 | 1261822 | 683299 | 392971 | 277151 | 127146 | 119167 | 29408 | 33632 |
| 1993 | 1323036 | 1119575 | 624071 | 336558 | 198029 | 129836 | 61087 | 60173 | 36415 |
| 1994 | 1153606 | 717342 | 568806 | 314580 | 171294 | 98773 | 66614 | 32928 | 54115 |
| 1995 | 2445189 | 617982 | 365105 | 283792 | 155640 | 87923 | 52862 | 35154 | 47977 |
| 1996 | 2778711 | 1407124 | 325734 | 180676 | 135174 | 76058 | 46781 | 27996 | 46500 |
| 1997 | 5242652 | 1678974 | 686924 | 161141 | 92789 | 66172 | 39800 | 26257 | 42762 |
| 1998 | 2106233 | 3045779 | 737114 | 288784 | 80614 | 42453 | 32141 | 22001 | 40031 |
| 1999 | 2022221 | 1116590 | 1557418 | 300058 | 118298 | 44761 | 22550 | 18824 | 37680 |
| 2000 | 2494293 | 1115075 | 558769 | 817957 | 119585 | 55622 | 22873 | 13682 | 34776 |
| 2001 | 1750258 | 1417225 | 642183 | 346829 | 437229 | 60609 | 30180 | 14329 | 32253 |
| 2002 | 4939698 | 974607 | 623173 | 298373 | 175176 | 204268 | 34888 | 18858 | 30076 |
| 2003 | 1851295 | 2679298 | 482502 | 314813 | 161863 | 94624 | 123176 | 20960 | 31515 |
| 2004 | 3558425 | 1004114 | 1320244 | 251010 | 171557 | 94739 | 53777 | 75370 | 34530 |
| 2005 | 2742165 | 2073404 | 490908 | 712545 | 142963 | 119538 | 62704 | 36296 | 77448 |
| 2006 | 3221142 | 1561611 | 1134272 | 293447 | 422870 | 88568 | 82746 | 42863 | 83395 |
| 2007 | 4801488 | 1842884 | 863752 | 657952 | 193751 | 294281 | 62457 | 61230 | 94736 |
| 2008 | 4045646 | 2889725 | 998008 | 532842 | 417646 | 124892 | 221892 | 46755 | 118592 |
| 2009 | 4109461 | 2286048 | 1662885 | 587903 | 334925 | 278924 | 85734 | 160460 | 133291 |
| 2010 | 4651307 | 2302598 | 1392456 | 1031028 | 369733 | 215992 | 207687 | 63745 | 221685 |
| 2011 | 6375173 | 2737552 | 1368273 | 953178 | 683038 | 244177 | 142160 | 152935 | 225390 |
| 2012 | 3862834 | 3889331 | 1915982 | 903521 | 612314 | 438425 | 160741 | 101833 | 269440 |
| 2013 | 4728470 | 2462591 | 2271226 | 1190985 | 557269 | 392808 | 284855 | 112645 | 258480 |
| 2014 | 5749449 | 2852874 | 1641310 | 1381773 | 742468 | 343636 | 248342 | 193299 | 257443 |
| 2015 | 2840719 | 3312782 | 1805209 | 1095041 | 817629 | 464849 | 231377 | 172626 | 312180 |
| 2016 | 3398171 | 1700132 | 1792133 | 1142139 | 700492 | 490997 | 299596 | 162279 | 328992 |
| 2017 | 4870276 | 2045016 | 966398 | 1072378 | 682031 | 419782 | 290099 | 197736 | 319352 |
| 2018 | 3067990 | 2960283 | 1195632 | 587802 | 626072 | 403587 | 264059 | 193868 | 347640 |
| 2019 | 7105721 | 1828405 | 1672211 | 658307 | 353750 | 357932 | 248434 | 178858 | 360029 |
| 2020 | 5073065 | 3955776 | 1087576 | 1016370 | 401899 | 220007 | 241748 | 173877 | 376728 |