| Table 3. Estimated stock numbers at age. | |||||||||||||
| Year Age | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
| 1961 | 8585 | 7242 | 5771 | 3535 | 1919 | 1341 | 1014 | 673 | 309 | 123 | 59 | 6 | 294 |
| 1962 | 13808 | 6908 | 5739 | 4319 | 2413 | 1356 | 1005 | 724 | 493 | 220 | 71 | 50 | 201 |
| 1963 | 20524 | 9580 | 4808 | 4110 | 3099 | 1629 | 1047 | 737 | 491 | 386 | 181 | 40 | 143 |
| 1964 | 16801 | 18133 | 8511 | 3772 | 3092 | 2188 | 1132 | 745 | 472 | 332 | 208 | 117 | 91 |
| 1965 | 20653 | 11690 | 13331 | 5924 | 2644 | 2068 | 1372 | 792 | 503 | 301 | 217 | 115 | 132 |
| 1966 | 15136 | 16175 | 8474 | 9495 | 3945 | 1737 | 1327 | 792 | 501 | 292 | 153 | 113 | 134 |
| 1967 | 19401 | 11672 | 11649 | 5734 | 6313 | 2455 | 1083 | 824 | 432 | 290 | 164 | 73 | 117 |
| 1968 | 20005 | 16937 | 9394 | 8286 | 3937 | 3920 | 1485 | 668 | 500 | 249 | 176 | 102 | 140 |
| 1969 | 32785 | 15901 | 13216 | 7487 | 6028 | 2844 | 2443 | 923 | 420 | 338 | 144 | 108 | 124 |
| 1970 | 29726 | 32467 | 10798 | 9097 | 5406 | 4148 | 1898 | 1355 | 511 | 239 | 206 | 81 | 126 |
| 1971 | 33540 | 23163 | 23223 | 7406 | 6332 | 3954 | 2852 | 1328 | 793 | 319 | 144 | 125 | 118 |
| 1972 | 34227 | 21980 | 15917 | 13346 | 5640 | 4895 | 3321 | 2287 | 1062 | 532 | 198 | 118 | 154 |
| 1973 | 27058 | 26083 | 18069 | 11335 | 7430 | 3549 | 3088 | 2100 | 1342 | 631 | 294 | 135 | 206 |
| 1974 | 24711 | 19281 | 15587 | 10637 | 6963 | 4105 | 2274 | 2023 | 1313 | 835 | 388 | 233 | 274 |
| 1975 | 20279 | 15419 | 11809 | 8734 | 6243 | 4591 | 2580 | 1545 | 1338 | 855 | 534 | 278 | 393 |
| 1976 | 22766 | 13577 | 8253 | 6193 | 5319 | 4227 | 3322 | 1923 | 1163 | 893 | 549 | 374 | 485 |
| 1977 | 15487 | 14865 | 7411 | 4656 | 3631 | 3667 | 3091 | 2522 | 1577 | 921 | 662 | 389 | 545 |
| 1978 | 9335 | 10424 | 8538 | 3688 | 2491 | 2150 | 2482 | 2294 | 2017 | 1166 | 725 | 525 | 641 |
| 1979 | 7834 | 6467 | 6352 | 5025 | 2338 | 1621 | 1212 | 1677 | 1548 | 1437 | 803 | 505 | 972 |
| 1980 | 15054 | 6031 | 4150 | 3680 | 3077 | 1390 | 962 | 690 | 943 | 919 | 1147 | 571 | 1077 |
| 1981 | 17371 | 10525 | 4159 | 2718 | 2336 | 1864 | 879 | 588 | 371 | 530 | 598 | 867 | 1233 |
| 1982 | 13763 | 18989 | 6104 | 2864 | 1448 | 1182 | 897 | 451 | 315 | 194 | 292 | 344 | 1415 |
| 1983 | 39743 | 9703 | 15305 | 3811 | 1564 | 807 | 552 | 426 | 270 | 170 | 100 | 208 | 892 |
| 1984 | 19982 | 34769 | 7121 | 9491 | 1983 | 763 | 381 | 208 | 243 | 142 | 65 | 56 | 525 |
| 1985 | 26094 | 18470 | 19098 | 4126 | 4716 | 922 | 377 | 173 | 100 | 153 | 69 | 28 | 313 |
| 1986 | 40227 | 17285 | 12855 | 8829 | 2391 | 2243 | 481 | 221 | 104 | 52 | 83 | 26 | 153 |
| 1987 | 41145 | 36894 | 11726 | 6860 | 3288 | 1294 | 899 | 207 | 112 | 42 | 20 | 32 | 73 |
| 1988 | 37477 | 29858 | 29261 | 6295 | 3136 | 1443 | 711 | 397 | 97 | 57 | 34 | 7 | 26 |
| 1989 | 23690 | 33906 | 22648 | 18114 | 2784 | 1445 | 626 | 359 | 179 | 52 | 22 | 26 | 29 |
| 1990 | 17425 | 20769 | 23755 | 15411 | 9451 | 1431 | 667 | 302 | 217 | 78 | 34 | 15 | 42 |
| 1991 | 23823 | 16011 | 14556 | 11035 | 6819 | 3953 | 745 | 408 | 177 | 126 | 38 | 16 | 25 |
| 1992 | 18542 | 19706 | 9566 | 6130 | 3597 | 2538 | 1552 | 302 | 180 | 59 | 50 | 13 | 15 |
| 1993 | 25803 | 14715 | 13041 | 4383 | 2424 | 1464 | 1207 | 683 | 129 | 79 | 17 | 14 | 7 |
| 1994 | 15218 | 19553 | 9785 | 6733 | 1968 | 1163 | 743 | 652 | 346 | 58 | 44 | 6 | 6 |
| 1995 | 16332 | 9747 | 9963 | 6568 | 3199 | 880 | 620 | 378 | 296 | 165 | 26 | 26 | 7 |
| 1996 | 14014 | 15289 | 6099 | 4388 | 2923 | 1234 | 435 | 253 | 188 | 126 | 70 | 7 | 16 |
| 1997 | 20648 | 11112 | 13250 | 4336 | 3154 | 1648 | 500 | 201 | 103 | 105 | 64 | 33 | 13 |
| 1998 | 12816 | 18178 | 10489 | 12794 | 3246 | 1575 | 861 | 217 | 90 | 45 | 52 | 29 | 18 |
| 1999 | 27210 | 9244 | 16480 | 8450 | 11608 | 1849 | 766 | 354 | 84 | 39 | 16 | 23 | 19 |
| 2000 | 36945 | 32087 | 6825 | 14605 | 6256 | 7124 | 735 | 378 | 132 | 35 | 13 | 6 | 10 |
| 2001 | 76159 | 26526 | 32946 | 5130 | 8249 | 3064 | 2523 | 462 | 159 | 50 | 16 | 9 | 7 |
| 2002 | 42850 | 75088 | 20980 | 25257 | 2340 | 2795 | 1222 | 761 | 127 | 40 | 14 | 3 | 4 |
| 2003 | 42814 | 46759 | 54617 | 12232 | 10937 | 1107 | 824 | 611 | 245 | 49 | 10 | 4 | 2 |
| 2004 | 18004 | 39993 | 53540 | 40236 | 6147 | 3696 | 361 | 419 | 231 | 80 | 16 | 3 | 2 |
| 2005 | 37512 | 24323 | 31533 | 45567 | 17245 | 2444 | 1169 | 161 | 140 | 56 | 15 | 4 | 1 |
| 2006 | 33830 | 39228 | 24483 | 19899 | 23619 | 8110 | 920 | 510 | 67 | 38 | 19 | 6 | 2 |
| 2007 | 25521 | 18448 | 36366 | 15206 | 9791 | 8738 | 3021 | 564 | 142 | 22 | 13 | 5 | 2 |
| 2008 | 45233 | 17221 | 9281 | 22103 | 7844 | 5752 | 4211 | 1037 | 249 | 29 | 7 | 4 | 2 |
| 2009 | 16330 | 21466 | 11863 | 4288 | 9546 | 4122 | 3016 | 2159 | 451 | 81 | 8 | 2 | 2 |
| 2010 | 25757 | 10728 | 12395 | 2823 | 2314 | 3997 | 2235 | 1507 | 894 | 147 | 29 | 3 | 1 |
| 2011 | 42545 | 15958 | 5127 | 4090 | 1298 | 1031 | 1758 | 1033 | 620 | 326 | 58 | 9 | 1 |
| 2012 | 22966 | 29223 | 11741 | 2561 | 1569 | 700 | 621 | 805 | 431 | 180 | 135 | 23 | 3 |
| 2013 | 13661 | 19492 | 12754 | 7055 | 1180 | 736 | 319 | 300 | 298 | 126 | 39 | 45 | 7 |
| 2014 | 16801 | 11176 | 10648 | 4870 | 2622 | 578 | 387 | 213 | 157 | 98 | 38 | 7 | 17 |
| 2015 | 41200 | 9840 | 7929 | 4922 | 2161 | 903 | 333 | 212 | 132 | 81 | 37 | 16 | 11 |
| 2016 | 21521 | 42104 | 4795 | 3855 | 1591 | 856 | 281 | 156 | 155 | 66 | 42 | 10 | 8 |
| 2017 | 10984 | 19300 | 24201 | 2280 | 1552 | 954 | 359 | 158 | 43 | 95 | 59 | 22 | 10 |
| 2018 | 6802 | 7698 | 13252 | 11398 | 1082 | 740 | 404 | 229 | 118 | 35 | 76 | 42 | 23 |
| 2019 | 27849 | 4286 | 4725 | 6605 | 4193 | 741 | 482 | 231 | 120 | 76 | 29 | 53 | 45 |
| 2020 | 8579 | 20170 | 2172 | 3167 | 3700 | 1563 | 508 | 431 | 89 | 89 | 62 | 21 | 70 |
| 2021 | 18934 | 5056 | 9165 | 1305 | 1878 | 2258 | 866 | 568 | 228 | 78 | 68 | 45 | 65 |
| 2022 | 6782 | 17296 | 2844 | 3689 | 817 | 1113 | 1367 | 740 | 482 | 233 | 45 | 52 | 72 |
| 2023 | 28724 | 4406 | 9179 | 1734 | 1779 | 565 | 840 | 933 | 514 | 354 | 169 | 36 | 104 |
| 2024 | 28420 | 22878 | 3239 | 3349 | 1101 | 937 | 475 | 812 | 713 | 422 | 288 | 132 | 121 |
| 2025 | 23847 | 24487 | 10631 | 1533 | 1738 | 524 | 413 | 506 | 631 | 523 | 330 | 220 | 193 |