| Table 3. Estimated stock numbers at age. | |||||||||
| Year Age | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| 1957 | 1713409 | 702998 | 832955 | 474478 | 313972 | 111874 | 135583 | 118303 | 204595 |
| 1958 | 2500009 | 1009108 | 436377 | 541601 | 305199 | 197039 | 80355 | 92859 | 226215 |
| 1959 | 2972069 | 1482596 | 627404 | 272108 | 340756 | 194558 | 128843 | 55265 | 222230 |
| 1960 | 2640263 | 1739754 | 873254 | 386325 | 166957 | 215213 | 127141 | 86171 | 191280 |
| 1961 | 2848863 | 1542632 | 1010547 | 525589 | 242631 | 106775 | 135726 | 85681 | 190555 |
| 1962 | 2056166 | 1702873 | 926400 | 604512 | 328228 | 150848 | 71843 | 89868 | 188306 |
| 1963 | 2413621 | 1195883 | 997677 | 561624 | 367472 | 203440 | 96456 | 48622 | 193330 |
| 1964 | 6122727 | 1365306 | 684173 | 568889 | 345079 | 230741 | 121963 | 61931 | 166024 |
| 1965 | 2378055 | 4007449 | 745553 | 390724 | 314846 | 206715 | 143618 | 78497 | 156724 |
| 1966 | 1865986 | 1391619 | 2634002 | 424198 | 237642 | 192121 | 127240 | 93388 | 160158 |
| 1967 | 1259047 | 1118643 | 790205 | 1644430 | 244922 | 144205 | 122746 | 80976 | 168435 |
| 1968 | 1291029 | 748292 | 643847 | 453316 | 1035719 | 135991 | 87654 | 81295 | 168172 |
| 1969 | 1852687 | 727585 | 451592 | 382779 | 272528 | 689318 | 83585 | 57040 | 172452 |
| 1970 | 1703614 | 1082356 | 417169 | 277014 | 234964 | 178560 | 439085 | 52992 | 152853 |
| 1971 | 1120542 | 1008599 | 575193 | 221987 | 156229 | 140176 | 109894 | 263586 | 136247 |
| 1972 | 990140 | 642828 | 586009 | 324223 | 128562 | 93018 | 87955 | 69695 | 255169 |
| 1973 | 3286044 | 535161 | 350964 | 344121 | 190139 | 74487 | 54401 | 55461 | 207166 |
| 1974 | 2541860 | 1935320 | 287009 | 192040 | 186281 | 102691 | 44146 | 33564 | 165702 |
| 1975 | 1802575 | 1459890 | 1087172 | 148542 | 103214 | 98652 | 59916 | 27060 | 124264 |
| 1976 | 1480191 | 985354 | 752031 | 573115 | 74575 | 52929 | 53194 | 35240 | 91233 |
| 1977 | 2121708 | 797710 | 533426 | 416999 | 337758 | 44459 | 30777 | 31767 | 78221 |
| 1978 | 1907302 | 1166297 | 401106 | 279757 | 227149 | 173655 | 27511 | 18351 | 66757 |
| 1979 | 1839682 | 1060765 | 606644 | 215108 | 155423 | 134668 | 98920 | 16704 | 53296 |
| 1980 | 2673687 | 954717 | 486028 | 284836 | 102049 | 78405 | 69243 | 53987 | 40923 |
| 1981 | 2111721 | 1457996 | 483707 | 221741 | 139571 | 55088 | 44700 | 40834 | 58296 |
| 1982 | 4558283 | 1140669 | 737352 | 239270 | 105945 | 70443 | 32154 | 26130 | 61367 |
| 1983 | 3067095 | 2539468 | 563769 | 339497 | 113479 | 52965 | 37970 | 18553 | 53195 |
| 1984 | 2910399 | 1648815 | 1288673 | 289255 | 152055 | 59083 | 29155 | 22301 | 43840 |
| 1985 | 3677406 | 1530135 | 795036 | 652914 | 145329 | 70888 | 32043 | 16650 | 40271 |
| 1986 | 9392685 | 2062904 | 768113 | 422338 | 310822 | 81662 | 37069 | 18251 | 35113 |
| 1987 | 4261836 | 5361988 | 977503 | 365074 | 210103 | 138746 | 41874 | 19454 | 30857 |
| 1988 | 4227340 | 2332987 | 2488981 | 460011 | 170052 | 94415 | 66442 | 20873 | 28919 |
| 1989 | 2878294 | 2326336 | 1105139 | 1163240 | 218423 | 76266 | 44822 | 34801 | 28357 |
| 1990 | 2542641 | 1552924 | 1134413 | 546406 | 560769 | 106990 | 37756 | 24274 | 36912 |
| 1991 | 2400951 | 1442115 | 808141 | 570933 | 268676 | 264311 | 55895 | 21163 | 36907 |
| 1992 | 2086596 | 1279622 | 692395 | 397744 | 280745 | 128564 | 119733 | 29962 | 34505 |
| 1993 | 1332987 | 1128455 | 627758 | 337844 | 200142 | 130646 | 61369 | 60197 | 37290 |
| 1994 | 1149559 | 718523 | 568603 | 313631 | 170539 | 99008 | 66847 | 33060 | 54239 |
| 1995 | 2438814 | 609317 | 361943 | 280512 | 153469 | 86902 | 52867 | 34993 | 47413 |
| 1996 | 2745012 | 1407771 | 319318 | 176680 | 131172 | 73559 | 45841 | 27602 | 45359 |
| 1997 | 5066732 | 1681918 | 686898 | 156041 | 90143 | 63451 | 38034 | 25390 | 41187 |
| 1998 | 2046738 | 2963656 | 735350 | 285506 | 77912 | 40250 | 30172 | 20694 | 37968 |
| 1999 | 1966219 | 1076431 | 1516203 | 294094 | 114194 | 43313 | 21111 | 17490 | 35138 |
| 2000 | 2442159 | 1080478 | 533253 | 799906 | 114160 | 53016 | 21509 | 12674 | 31960 |
| 2001 | 1687431 | 1390182 | 628751 | 337049 | 426686 | 56995 | 28174 | 13294 | 29440 |
| 2002 | 4792567 | 937598 | 598465 | 285155 | 168827 | 195036 | 32933 | 17441 | 27220 |
| 2003 | 1797841 | 2584633 | 461818 | 298471 | 153814 | 89972 | 117863 | 19490 | 28299 |
| 2004 | 3409096 | 969733 | 1264029 | 238232 | 160316 | 89274 | 50180 | 70996 | 30969 |
| 2005 | 2653833 | 1992149 | 466895 | 672878 | 134159 | 112382 | 58876 | 33861 | 71315 |
| 2006 | 3118441 | 1514831 | 1089757 | 279666 | 395427 | 81434 | 77389 | 40218 | 77122 |
| 2007 | 4455281 | 1790878 | 845520 | 623802 | 186753 | 274448 | 56657 | 57682 | 88427 |
| 2008 | 3967236 | 2715244 | 956066 | 516744 | 394735 | 115804 | 211852 | 42770 | 110026 |
| 2009 | 3891265 | 2212916 | 1565802 | 559470 | 321598 | 260730 | 78009 | 152336 | 124502 |
| 2010 | 4215813 | 2182842 | 1321680 | 979364 | 347104 | 198715 | 195983 | 58619 | 208190 |
| 2011 | 6030944 | 2467643 | 1307372 | 900316 | 647707 | 225730 | 130833 | 145981 | 215177 |
| 2012 | 3644765 | 3672623 | 1788761 | 868827 | 578394 | 412647 | 148957 | 94779 | 258523 |
| 2013 | 4303682 | 2296158 | 2145969 | 1106743 | 526282 | 365273 | 266473 | 104479 | 240933 |
| 2014 | 5318092 | 2624903 | 1545454 | 1299773 | 696332 | 318282 | 230963 | 181314 | 238490 |
| 2015 | 2671023 | 3049846 | 1699901 | 1019030 | 770847 | 429190 | 215459 | 162229 | 290995 |
| 2016 | 2969466 | 1595311 | 1668824 | 1069471 | 659444 | 458981 | 280844 | 153317 | 308793 |
| 2017 | 4633930 | 1776629 | 935359 | 990336 | 639365 | 392777 | 273603 | 187507 | 301604 |
| 2018 | 2746465 | 2794312 | 1057529 | 562361 | 578709 | 374739 | 249102 | 185314 | 331604 |
| 2019 | 6320916 | 1644759 | 1596719 | 588073 | 332490 | 333137 | 233305 | 171492 | 345588 |
| 2020 | 4436442 | 3529989 | 992385 | 981486 | 359063 | 206252 | 231309 | 166759 | 366044 |