| Table 3. Estimated stock numbers at age. | |||||||||
| Year Age | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| 1978 | 30941247 | 8368461 | 1817629 | 800616 | 230042 | 19637 | 13762 | 4140 | 1913 |
| 1979 | 22480790 | 9232688 | 2273081 | 639201 | 275918 | 73318 | 6291 | 4291 | 2769 |
| 1980 | 12907076 | 6762335 | 2488560 | 779556 | 204096 | 89115 | 21583 | 2161 | 3492 |
| 1981 | 11956126 | 3396322 | 2062454 | 893271 | 243258 | 57271 | 21382 | 6319 | 2835 |
| 1982 | 9650923 | 3095585 | 837844 | 810608 | 278309 | 66197 | 13463 | 5472 | 3854 |
| 1983 | 12325752 | 2456982 | 751363 | 323412 | 300459 | 94141 | 18468 | 4295 | 4697 |
| 1984 | 11339801 | 3498106 | 597346 | 274884 | 104099 | 98143 | 27080 | 5957 | 4614 |
| 1985 | 17884312 | 2974101 | 951142 | 216258 | 80934 | 28254 | 26176 | 6944 | 4790 |
| 1986 | 16235798 | 5570892 | 828420 | 399726 | 79451 | 25453 | 6782 | 7055 | 4994 |
| 1987 | 14670302 | 4763694 | 1591416 | 305952 | 138626 | 20810 | 6205 | 1718 | 5047 |
| 1988 | 18158959 | 4200972 | 1554001 | 576571 | 96607 | 38273 | 4372 | 1440 | 3419 |
| 1989 | 11636347 | 5732469 | 1042796 | 609306 | 187428 | 28342 | 10536 | 1493 | 2927 |
| 1990 | 10907275 | 3209618 | 1845738 | 400262 | 223687 | 58169 | 7044 | 3572 | 2550 |
| 1991 | 12771029 | 2935391 | 855480 | 722949 | 123713 | 69326 | 19682 | 2904 | 3559 |
| 1992 | 14601821 | 3517220 | 905929 | 329800 | 299823 | 39177 | 22885 | 10017 | 3732 |
| 1993 | 14631492 | 3970319 | 936305 | 376671 | 136494 | 116339 | 13578 | 9082 | 7601 |
| 1994 | 13346577 | 3894155 | 1082332 | 351052 | 132023 | 49985 | 41994 | 5553 | 8905 |
| 1995 | 10436001 | 3400279 | 1096585 | 430003 | 126910 | 44274 | 16017 | 17077 | 7960 |
| 1996 | 8300665 | 2359484 | 922799 | 452139 | 172445 | 46856 | 16231 | 6637 | 13506 |
| 1997 | 12113296 | 1795113 | 603477 | 397672 | 174747 | 69686 | 17677 | 7062 | 11430 |
| 1998 | 19051461 | 2651204 | 469568 | 257654 | 168708 | 71700 | 29957 | 8902 | 10796 |
| 1999 | 19257096 | 4155641 | 711923 | 199867 | 124687 | 74316 | 32737 | 13696 | 11178 |
| 2000 | 15370293 | 3758123 | 1126929 | 291237 | 88607 | 51329 | 31013 | 16543 | 13867 |
| 2001 | 14461924 | 2862707 | 1169637 | 468567 | 126158 | 35676 | 22815 | 13749 | 16446 |
| 2002 | 9265823 | 2591740 | 855653 | 652839 | 231165 | 58530 | 15081 | 11374 | 16245 |
| 2003 | 8364444 | 1443719 | 682957 | 447338 | 341892 | 114880 | 28170 | 7440 | 15638 |
| 2004 | 8545640 | 1255886 | 302890 | 299844 | 234737 | 168368 | 64738 | 15837 | 13424 |
| 2005 | 8261881 | 1297690 | 319014 | 123718 | 149366 | 123614 | 83907 | 35478 | 16961 |
| 2006 | 6413902 | 1276828 | 361537 | 136219 | 61850 | 83358 | 67876 | 43275 | 29348 |
| 2007 | 8495282 | 897525 | 335912 | 166572 | 59999 | 29916 | 42875 | 35112 | 40033 |
| 2008 | 8198358 | 1325192 | 239718 | 155799 | 77986 | 27773 | 14209 | 22442 | 41818 |
| 2009 | 7682778 | 1360652 | 350101 | 100491 | 67455 | 40083 | 13914 | 7451 | 34470 |
| 2010 | 7878324 | 1280417 | 409785 | 142636 | 48489 | 33475 | 19039 | 6484 | 21499 |
| 2011 | 6224537 | 1318133 | 418342 | 189520 | 70966 | 23473 | 14798 | 8294 | 13720 |
| 2012 | 5583793 | 927932 | 423821 | 183015 | 94848 | 35660 | 11361 | 6991 | 11627 |
| 2013 | 8825851 | 737191 | 240260 | 211058 | 93497 | 41922 | 16424 | 5270 | 9817 |
| 2014 | 10586878 | 1315242 | 222532 | 116944 | 107615 | 43624 | 18996 | 8320 | 8334 |
| 2015 | 10047540 | 1515553 | 432030 | 94958 | 58593 | 50109 | 18635 | 8804 | 8769 |
| 2016 | 11711020 | 1425607 | 441653 | 179042 | 44915 | 25201 | 20480 | 8846 | 9125 |
| 2017 | 7999496 | 1853847 | 439290 | 178742 | 72969 | 19501 | 9473 | 9526 | 9290 |
| 2018 | 10885002 | 1168271 | 551026 | 193555 | 79395 | 30877 | 7738 | 4556 | 9508 |
| 2019 | 19480670 | 1853294 | 359796 | 247470 | 92472 | 34643 | 12138 | 4078 | 7588 |
| 2020 | 19114125 | 3955623 | 530152 | 176981 | 120463 | 40041 | 14800 | 5574 | 6228 |
| 2021 | 10536518 | 3929532 | 1356738 | 241949 | 94967 | 56150 | 20049 | 8226 | 6797 |
| 2022 | 13046597 | 1799361 | 1331179 | 711546 | 128340 | 48479 | 29158 | 11368 | 9374 |
| 2023 | 10156240 | 2624668 | 622242 | 695359 | 406086 | 65882 | 25258 | 18157 | 13244 |
| 2024 | 15095394 | 1807861 | 776987 | 324090 | 444076 | 240624 | 34585 | 14247 | 20222 |
| 2025 | 15095394 | 2968851 | 554423 | 381560 | 180229 | 249096 | 141123 | 21997 | 23095 |