| Table 3. Estimated stock numbers at age. | |||||||||
| Year Age | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| 1978 | 31393056 | 8398374 | 1815737 | 803959 | 230092 | 19729 | 13731 | 4104 | 1775 |
| 1979 | 23133369 | 9371395 | 2264499 | 638556 | 276473 | 73552 | 6293 | 4303 | 2525 |
| 1980 | 12912256 | 7014926 | 2526435 | 777463 | 204309 | 88860 | 21700 | 2161 | 3472 |
| 1981 | 12224956 | 3478124 | 2097130 | 910431 | 243743 | 57505 | 21476 | 6341 | 2519 |
| 1982 | 9540126 | 3222070 | 859515 | 815146 | 285647 | 66797 | 13618 | 5609 | 3717 |
| 1983 | 12947329 | 2474953 | 794797 | 330656 | 300488 | 97120 | 18863 | 4463 | 4986 |
| 1984 | 11127589 | 3729442 | 618382 | 285846 | 107862 | 96905 | 28146 | 6318 | 4839 |
| 1985 | 17679397 | 2972861 | 1009364 | 223259 | 85022 | 28862 | 26162 | 7659 | 5104 |
| 1986 | 16378608 | 5456302 | 839067 | 415871 | 81038 | 26047 | 6977 | 7458 | 4732 |
| 1987 | 13576212 | 4868582 | 1565125 | 310950 | 143207 | 20727 | 6267 | 1822 | 4583 |
| 1988 | 18355005 | 3878346 | 1536882 | 568091 | 97522 | 38314 | 4340 | 1477 | 2448 |
| 1989 | 11267488 | 5767194 | 981333 | 591568 | 182049 | 28471 | 10386 | 1470 | 2579 |
| 1990 | 11246006 | 3120764 | 1788572 | 377894 | 213734 | 55961 | 6975 | 3487 | 2185 |
| 1991 | 13563191 | 3062949 | 819302 | 697815 | 117029 | 66874 | 18530 | 2836 | 3275 |
| 1992 | 15701007 | 3740826 | 886761 | 320051 | 289601 | 37678 | 21904 | 9150 | 2940 |
| 1993 | 15774819 | 4272739 | 930909 | 366548 | 130886 | 113466 | 12857 | 8603 | 7322 |
| 1994 | 14589110 | 4144180 | 1076517 | 348045 | 129529 | 47952 | 39804 | 5152 | 7117 |
| 1995 | 10793492 | 3700966 | 1080598 | 424637 | 125510 | 42784 | 15145 | 15594 | 6327 |
| 1996 | 8679225 | 2451429 | 921329 | 443327 | 169368 | 46517 | 15341 | 6094 | 12803 |
| 1997 | 12631815 | 1862926 | 594212 | 389837 | 171217 | 67231 | 17257 | 6567 | 9683 |
| 1998 | 19350098 | 2712052 | 462683 | 251273 | 163832 | 69054 | 28619 | 8502 | 9246 |
| 1999 | 19841990 | 4085785 | 687616 | 194605 | 119441 | 71044 | 30938 | 12969 | 9450 |
| 2000 | 15493685 | 3864960 | 1065016 | 277210 | 84374 | 48375 | 29085 | 15080 | 12630 |
| 2001 | 14591331 | 2849688 | 1144440 | 448547 | 117992 | 34260 | 20744 | 12485 | 16353 |
| 2002 | 8532382 | 2596614 | 832427 | 620944 | 220353 | 54818 | 14333 | 10145 | 13658 |
| 2003 | 7784196 | 1276436 | 668977 | 425686 | 319234 | 108084 | 26324 | 7006 | 12396 |
| 2004 | 7871306 | 1137641 | 283094 | 283592 | 219412 | 153709 | 59513 | 14533 | 10211 |
| 2005 | 7740643 | 1163423 | 301839 | 116621 | 139630 | 113475 | 75344 | 31829 | 14850 |
| 2006 | 5793334 | 1169029 | 343310 | 129205 | 58027 | 74881 | 60494 | 38255 | 25294 |
| 2007 | 7687541 | 807353 | 322480 | 157181 | 56174 | 27180 | 37368 | 30083 | 36557 |
| 2008 | 7738611 | 1203930 | 228462 | 147316 | 73274 | 25849 | 12612 | 18669 | 40131 |
| 2009 | 7335295 | 1263071 | 336793 | 97118 | 64877 | 36390 | 12462 | 6294 | 31655 |
| 2010 | 7566814 | 1215193 | 393292 | 138087 | 45930 | 30965 | 16615 | 5436 | 20237 |
| 2011 | 5838030 | 1256997 | 404360 | 180709 | 67318 | 21508 | 13111 | 6663 | 13454 |
| 2012 | 4885520 | 863510 | 414756 | 177744 | 89304 | 33323 | 9962 | 5751 | 12512 |
| 2013 | 8107491 | 650192 | 236363 | 205398 | 89680 | 39037 | 14716 | 4369 | 10516 |
| 2014 | 9334712 | 1211477 | 206160 | 112573 | 103561 | 41888 | 17194 | 7042 | 9281 |
| 2015 | 9041805 | 1384368 | 401448 | 90260 | 55895 | 48101 | 17296 | 7651 | 9435 |
| 2016 | 11322715 | 1305167 | 410954 | 169279 | 42641 | 24286 | 19207 | 7935 | 9318 |
| 2017 | 7400953 | 1824921 | 408636 | 169660 | 69969 | 18880 | 9033 | 8762 | 9190 |
| 2018 | 10325349 | 1079871 | 536031 | 186207 | 76294 | 29527 | 7451 | 4309 | 8198 |
| 2019 | 19098618 | 1733759 | 343607 | 238717 | 88440 | 32764 | 11644 | 3867 | 5802 |
| 2020 | 18230157 | 3848835 | 504389 | 168948 | 113504 | 37718 | 13944 | 5315 | 4127 |
| 2021 | 9412785 | 3708981 | 1310576 | 232002 | 90006 | 51803 | 18767 | 7684 | 4203 |
| 2022 | 11253007 | 1645966 | 1269179 | 682008 | 122111 | 45962 | 26660 | 10515 | 7423 |
| 2023 | 8053582 | 2296407 | 579431 | 660404 | 388683 | 62112 | 23860 | 16451 | 10921 |
| 2024 | 12777224 | 1456869 | 715796 | 300493 | 411032 | 223815 | 32649 | 13508 | 16772 |
| 2025 | 12777224 | 2581745 | 463145 | 349250 | 165253 | 230665 | 128876 | 20613 | 20670 |