| Table 3. Estimated stock numbers at age. | |||||||
| Year Age | 0 | 1 | 2 | 3 | 4 | 5 | 6 |
| 1978 | 28766397 | 8508380 | 1747094 | 840875 | 220155 | 15995 | 18593 |
| 1979 | 23412983 | 9132331 | 2155798 | 634702 | 282098 | 67213 | 10358 |
| 1980 | 11209457 | 7357320 | 2276212 | 762604 | 203877 | 86565 | 21085 |
| 1981 | 10245260 | 3377928 | 1963161 | 816324 | 238789 | 57248 | 26780 |
| 1982 | 8986294 | 3102401 | 864282 | 754784 | 265997 | 68392 | 22044 |
| 1983 | 13386559 | 2683093 | 801533 | 330698 | 278157 | 87073 | 27102 |
| 1984 | 10196656 | 4091382 | 691757 | 287494 | 107597 | 86500 | 32006 |
| 1985 | 17832826 | 3023680 | 1076637 | 242510 | 86042 | 28420 | 28534 |
| 1986 | 16824076 | 5535607 | 802305 | 425685 | 82651 | 24384 | 14735 |
| 1987 | 12813476 | 5178578 | 1489683 | 289671 | 138722 | 20651 | 8808 |
| 1988 | 17989023 | 3882780 | 1456105 | 546653 | 90569 | 35085 | 6195 |
| 1989 | 11126616 | 5597082 | 1020491 | 558955 | 184120 | 25894 | 9764 |
| 1990 | 9948980 | 3342482 | 1563095 | 393389 | 202629 | 56496 | 8982 |
| 1991 | 10879669 | 2930731 | 895974 | 570722 | 138305 | 65440 | 18300 |
| 1992 | 12675335 | 3165304 | 803372 | 349401 | 218533 | 52951 | 29311 |
| 1993 | 12398328 | 3540166 | 837519 | 318516 | 135880 | 85265 | 30866 |
| 1994 | 11545336 | 3315642 | 929529 | 318646 | 116799 | 46896 | 40405 |
| 1995 | 8964030 | 2967602 | 870555 | 368705 | 116514 | 39392 | 29193 |
| 1996 | 7486904 | 2133594 | 785775 | 357772 | 143848 | 42664 | 24260 |
| 1997 | 11418670 | 1678001 | 555157 | 336959 | 142781 | 56176 | 24861 |
| 1998 | 19025989 | 2367537 | 438642 | 242145 | 141930 | 57564 | 32239 |
| 1999 | 21632856 | 3718071 | 598621 | 197678 | 110039 | 58917 | 36774 |
| 2000 | 17843704 | 3952066 | 919658 | 252129 | 84652 | 44307 | 37500 |
| 2001 | 16726157 | 3039761 | 1042247 | 390465 | 105922 | 34932 | 31752 |
| 2002 | 8066932 | 2688047 | 801964 | 500229 | 183676 | 46558 | 28926 |
| 2003 | 8260261 | 1215086 | 699555 | 380522 | 246460 | 86696 | 35066 |
| 2004 | 9811859 | 1198861 | 293256 | 299276 | 187011 | 118319 | 58950 |
| 2005 | 9585826 | 1373241 | 308235 | 129436 | 145680 | 93415 | 87394 |
| 2006 | 7423456 | 1337187 | 366600 | 135819 | 64911 | 72482 | 91088 |
| 2007 | 11829047 | 986075 | 355523 | 162195 | 64778 | 30967 | 80064 |
| 2008 | 11741659 | 1579653 | 277361 | 155337 | 79120 | 31475 | 55367 |
| 2009 | 11511157 | 1542031 | 446069 | 121879 | 74589 | 39323 | 43578 |
| 2010 | 11978757 | 1506741 | 439677 | 196502 | 57737 | 37562 | 40393 |
| 2011 | 7856033 | 1584348 | 449591 | 198577 | 93358 | 27196 | 36631 |
| 2012 | 5776782 | 1027026 | 501233 | 198754 | 95376 | 45259 | 30922 |
| 2013 | 9449991 | 737385 | 299879 | 233986 | 98246 | 46318 | 36224 |
| 2014 | 11421837 | 1255416 | 229950 | 137169 | 115251 | 47331 | 38949 |
| 2015 | 10452857 | 1506620 | 400423 | 106749 | 65381 | 53989 | 39569 |
| 2016 | 12699306 | 1396099 | 457907 | 177409 | 50600 | 29461 | 41594 |
| 2017 | 8063813 | 1825627 | 432974 | 199798 | 81891 | 22788 | 32462 |
| 2018 | 10356309 | 1198169 | 582487 | 198866 | 93289 | 37691 | 26594 |
| 2019 | 21574670 | 1636096 | 397776 | 263810 | 96967 | 42822 | 31817 |
| 2020 | 18037249 | 3668913 | 541214 | 189013 | 124159 | 46119 | 37429 |
| 2021 | 9241311 | 3205653 | 1271811 | 254750 | 95696 | 59141 | 44384 |
| 2022 | 12605197 | 1679232 | 1116322 | 618567 | 135737 | 48925 | 57090 |
| 2023 | 6066015 | 2541916 | 612810 | 553208 | 345015 | 72702 | 62608 |
| 2024 | 6066015 | 1167847 | 917037 | 313104 | 314169 | 185698 | 81006 |