| Table 3. Estimated stock numbers at age. | |||||||||
| Year Age | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 
| 1972 | 12495757 | 12720157 | 2148672 | 73188 | 44739 | 420071 | 8081 | 503 | 1213 | 
| 1973 | 32490705 | 3299897 | 2451080 | 523124 | 16571 | 11818 | 134938 | 2680 | 836 | 
| 1974 | 66838479 | 8978681 | 594462 | 668191 | 126645 | 4615 | 3875 | 45022 | 1040 | 
| 1975 | 6157013 | 18659315 | 1696450 | 143850 | 172192 | 35003 | 1554 | 1311 | 12897 | 
| 1976 | 7118275 | 1609686 | 3637488 | 400627 | 31079 | 45244 | 10575 | 474 | 3998 | 
| 1977 | 10341594 | 1876705 | 301158 | 948682 | 86469 | 8249 | 13590 | 3323 | 1394 | 
| 1978 | 18104338 | 2752008 | 357100 | 74574 | 231827 | 21677 | 2566 | 4363 | 2098 | 
| 1979 | 29263932 | 4797965 | 565516 | 90362 | 16979 | 62494 | 6350 | 813 | 1982 | 
| 1980 | 7566624 | 7823911 | 1046048 | 160223 | 21376 | 4741 | 20882 | 2125 | 999 | 
| 1981 | 12242196 | 1919005 | 1769629 | 331859 | 43405 | 6176 | 1754 | 7980 | 893 | 
| 1982 | 7133575 | 3202426 | 422788 | 650261 | 104142 | 15371 | 2469 | 825 | 3295 | 
| 1983 | 22108685 | 1815371 | 736850 | 150734 | 209866 | 35605 | 6717 | 1068 | 2155 | 
| 1984 | 5646185 | 5950455 | 447011 | 251392 | 46235 | 66759 | 12498 | 2666 | 1067 | 
| 1985 | 7584057 | 1456209 | 1457307 | 164301 | 72777 | 14032 | 22980 | 4399 | 1543 | 
| 1986 | 12368506 | 1994025 | 350945 | 513203 | 47127 | 20426 | 4612 | 7897 | 1470 | 
| 1987 | 1977146 | 3437363 | 486989 | 112160 | 137890 | 12771 | 6048 | 1513 | 4344 | 
| 1988 | 2113220 | 522463 | 916588 | 149662 | 28365 | 37027 | 4014 | 1716 | 2960 | 
| 1989 | 3287573 | 567473 | 136328 | 323160 | 37249 | 7637 | 12732 | 1431 | 1346 | 
| 1990 | 7935898 | 890403 | 148635 | 46911 | 89235 | 10074 | 2513 | 4473 | 758 | 
| 1991 | 11425712 | 2214561 | 240784 | 46943 | 12883 | 26975 | 3505 | 939 | 2379 | 
| 1992 | 15581117 | 3017013 | 615416 | 79212 | 11778 | 3595 | 9188 | 1214 | 1394 | 
| 1993 | 5359832 | 4070809 | 764022 | 216900 | 24096 | 3891 | 1151 | 3722 | 1881 | 
| 1994 | 17860130 | 1410721 | 1006377 | 226475 | 58979 | 7700 | 1510 | 401 | 2736 | 
| 1995 | 7296170 | 5093134 | 392041 | 335362 | 62090 | 18848 | 3152 | 677 | 1696 | 
| 1996 | 8448868 | 1862606 | 1374007 | 153135 | 107567 | 21474 | 7670 | 1509 | 634 | 
| 1997 | 4012164 | 2368627 | 500922 | 508744 | 48884 | 34426 | 8272 | 3523 | 684 | 
| 1998 | 3157135 | 1114719 | 617447 | 188271 | 173147 | 18159 | 13612 | 4071 | 1884 | 
| 1999 | 36616348 | 852261 | 301229 | 208833 | 61629 | 56994 | 7136 | 6453 | 2712 | 
| 2000 | 8858289 | 10611714 | 237584 | 100634 | 54655 | 19116 | 18608 | 3166 | 2121 | 
| 2001 | 1398007 | 2510160 | 2841338 | 91141 | 31458 | 17404 | 8147 | 8278 | 2217 | 
| 2002 | 1616735 | 407960 | 712153 | 1203515 | 32423 | 13033 | 8039 | 4901 | 4202 | 
| 2003 | 1205576 | 451025 | 119886 | 342488 | 533611 | 13591 | 6322 | 4645 | 3582 | 
| 2004 | 1174121 | 348538 | 133747 | 60629 | 179383 | 283989 | 7278 | 3888 | 2658 | 
| 2005 | 5230100 | 335690 | 101934 | 63307 | 30558 | 91753 | 154168 | 4699 | 2515 | 
| 2006 | 1515967 | 1663209 | 99623 | 49779 | 29473 | 15996 | 47370 | 93048 | 3565 | 
| 2007 | 1111532 | 447924 | 548958 | 45652 | 22171 | 13214 | 7959 | 26968 | 34439 | 
| 2008 | 881368 | 333104 | 137029 | 276652 | 19740 | 9826 | 6697 | 4669 | 22350 | 
| 2009 | 4456197 | 268408 | 100275 | 71841 | 153258 | 9643 | 5200 | 4291 | 8180 | 
| 2010 | 543184 | 1497054 | 87442 | 57145 | 40841 | 92390 | 5594 | 3369 | 4922 | 
| 2011 | 346961 | 173240 | 491601 | 50170 | 32675 | 24243 | 59699 | 3495 | 3303 | 
| 2012 | 643717 | 109800 | 55677 | 288413 | 26335 | 19046 | 14380 | 38960 | 2897 | 
| 2013 | 672386 | 215100 | 33138 | 32485 | 173204 | 13871 | 11117 | 8897 | 21047 | 
| 2014 | 3967409 | 223807 | 64860 | 16998 | 20652 | 103935 | 7607 | 7043 | 12095 | 
| 2015 | 1235939 | 1379015 | 68342 | 32076 | 8056 | 11578 | 61219 | 4850 | 7675 | 
| 2016 | 1392311 | 433598 | 403310 | 30910 | 13617 | 3607 | 5392 | 38596 | 3031 | 
| 2017 | 636560 | 512759 | 135982 | 198293 | 13721 | 6168 | 1738 | 3498 | 14263 | 
| 2018 | 2140458 | 231857 | 153484 | 64536 | 100207 | 6102 | 3054 | 1053 | 5616 | 
| 2019 | 3835312 | 846432 | 70012 | 75349 | 29451 | 51899 | 3107 | 1728 | 1641 |