| Table 3. Estimated stock numbers at age. | ||||||||||
| Year Age | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| 1959 | 17355 | 12346 | 12096 | 2418 | 4319 | 625 | 525 | 161 | 27 | 0 |
| 1960 | 15932 | 14302 | 8740 | 6009 | 1196 | 1905 | 347 | 234 | 99 | 14 |
| 1961 | 23672 | 12571 | 7329 | 3687 | 2558 | 526 | 712 | 142 | 68 | 42 |
| 1962 | 24586 | 19920 | 7285 | 3489 | 1851 | 1145 | 244 | 230 | 54 | 49 |
| 1963 | 20654 | 20460 | 12680 | 3616 | 1727 | 761 | 515 | 133 | 89 | 52 |
| 1964 | 10991 | 17512 | 12696 | 6944 | 1740 | 841 | 346 | 230 | 82 | 74 |
| 1965 | 21011 | 8159 | 13298 | 7789 | 3551 | 841 | 379 | 130 | 123 | 79 |
| 1966 | 25540 | 17810 | 5454 | 8289 | 4040 | 1534 | 359 | 176 | 59 | 96 |
| 1967 | 21476 | 21509 | 13751 | 3634 | 5287 | 2099 | 672 | 114 | 58 | 71 |
| 1968 | 11868 | 18158 | 16434 | 8851 | 2449 | 3113 | 982 | 280 | 32 | 60 |
| 1969 | 9588 | 9437 | 13878 | 10836 | 4571 | 1212 | 1590 | 393 | 159 | 49 |
| 1970 | 12649 | 7560 | 6611 | 8564 | 6059 | 2234 | 559 | 724 | 126 | 89 |
| 1971 | 23109 | 10101 | 5639 | 4035 | 4792 | 3587 | 1162 | 238 | 377 | 110 |
| 1972 | 16715 | 20313 | 8395 | 4054 | 2482 | 2649 | 1658 | 512 | 85 | 230 |
| 1973 | 38649 | 12519 | 16462 | 6396 | 2771 | 1524 | 1075 | 764 | 321 | 194 |
| 1974 | 36618 | 33883 | 9008 | 9745 | 3828 | 1735 | 1064 | 506 | 406 | 294 |
| 1975 | 24842 | 30758 | 25381 | 6752 | 6577 | 2325 | 912 | 513 | 283 | 386 |
| 1976 | 11183 | 20989 | 23476 | 14029 | 3651 | 3598 | 1210 | 524 | 242 | 349 |
| 1977 | 14133 | 8459 | 15227 | 17659 | 7706 | 1679 | 1771 | 449 | 222 | 258 |
| 1978 | 16741 | 11629 | 6836 | 8907 | 9158 | 2912 | 642 | 500 | 148 | 206 |
| 1979 | 26082 | 13422 | 8593 | 5008 | 4613 | 4808 | 1356 | 287 | 210 | 184 |
| 1980 | 17599 | 22769 | 10788 | 5142 | 2743 | 2235 | 2274 | 706 | 114 | 201 |
| 1981 | 27774 | 13500 | 18227 | 6880 | 2793 | 1475 | 1066 | 1169 | 300 | 182 |
| 1982 | 30958 | 23354 | 10091 | 10907 | 3992 | 1411 | 691 | 414 | 540 | 246 |
| 1983 | 53118 | 24521 | 18052 | 6785 | 6033 | 2249 | 767 | 275 | 178 | 377 |
| 1984 | 22742 | 48374 | 18104 | 9100 | 3303 | 2464 | 820 | 214 | 81 | 259 |
| 1985 | 10237 | 18548 | 35621 | 10060 | 3977 | 1433 | 1264 | 411 | 99 | 193 |
| 1986 | 11566 | 7810 | 14353 | 20688 | 5001 | 1691 | 461 | 333 | 101 | 127 |
| 1987 | 11341 | 9573 | 6724 | 7970 | 9085 | 2078 | 601 | 159 | 141 | 110 |
| 1988 | 17391 | 8972 | 7939 | 4644 | 3844 | 4470 | 957 | 293 | 65 | 125 |
| 1989 | 5081 | 16169 | 6782 | 4605 | 2191 | 1767 | 1687 | 350 | 103 | 93 |
| 1990 | 6382 | 3720 | 11208 | 3593 | 1803 | 819 | 561 | 480 | 96 | 84 |
| 1991 | 10987 | 5100 | 2644 | 6201 | 1598 | 713 | 315 | 194 | 134 | 83 |
| 1992 | 11667 | 9335 | 3922 | 1724 | 2867 | 754 | 306 | 138 | 78 | 113 |
| 1993 | 27498 | 8985 | 7752 | 3121 | 968 | 1383 | 338 | 124 | 71 | 113 |
| 1994 | 44261 | 23181 | 7433 | 5536 | 2297 | 574 | 806 | 176 | 68 | 122 |
| 1995 | 12094 | 41972 | 17903 | 6210 | 3805 | 1585 | 379 | 594 | 121 | 131 |
| 1996 | 6126 | 9483 | 31974 | 13184 | 3345 | 2550 | 954 | 219 | 426 | 149 |
| 1997 | 7596 | 5072 | 7434 | 21774 | 7190 | 1136 | 898 | 258 | 55 | 185 |
| 1998 | 15922 | 6600 | 3941 | 5196 | 12052 | 2773 | 289 | 160 | 48 | 98 |
| 1999 | 24719 | 13364 | 5150 | 2773 | 3256 | 5265 | 814 | 87 | 33 | 62 |
| 2000 | 35843 | 20921 | 10701 | 2939 | 1602 | 2048 | 2157 | 214 | 21 | 45 |
| 2001 | 14865 | 33711 | 14825 | 6645 | 1456 | 1074 | 1403 | 950 | 81 | 40 |
| 2002 | 7637 | 12765 | 23299 | 8331 | 3468 | 856 | 696 | 640 | 428 | 59 |
| 2003 | 4739 | 6065 | 7983 | 11714 | 3728 | 1210 | 300 | 175 | 181 | 147 |
| 2004 | 7073 | 3643 | 4090 | 4484 | 4821 | 1291 | 351 | 98 | 60 | 150 |
| 2005 | 9220 | 6049 | 2710 | 2793 | 2873 | 1839 | 397 | 80 | 29 | 114 |
| 2006 | 5993 | 8021 | 3981 | 1524 | 1540 | 1455 | 631 | 129 | 23 | 84 |
| 2007 | 6367 | 4917 | 4846 | 2292 | 873 | 706 | 569 | 215 | 48 | 69 |
| 2008 | 10536 | 5000 | 3686 | 2715 | 1349 | 477 | 325 | 263 | 112 | 76 |
| 2009 | 15816 | 7702 | 5366 | 2281 | 1632 | 746 | 225 | 131 | 103 | 103 |
| 2010 | 5348 | 13229 | 6003 | 2342 | 1069 | 852 | 344 | 109 | 64 | 122 |
| 2011 | 1384 | 4146 | 8362 | 3190 | 935 | 439 | 305 | 117 | 42 | 106 |
| 2012 | 3292 | 1051 | 2626 | 4360 | 1406 | 375 | 184 | 129 | 46 | 98 |
| 2013 | 8429 | 2507 | 1183 | 1628 | 2121 | 567 | 121 | 67 | 46 | 85 |
| 2014 | 3149 | 7165 | 2418 | 950 | 1236 | 1022 | 255 | 57 | 31 | 83 |
| 2015 | 5045 | 2606 | 5107 | 1629 | 590 | 658 | 457 | 112 | 39 | 80 |
| 2016 | 6316 | 4030 | 2429 | 2958 | 797 | 338 | 296 | 157 | 41 | 73 |
| 2017 | 12828 | 4998 | 2749 | 2154 | 1614 | 420 | 185 | 115 | 61 | 73 |
| 2018 | 7180 | 10945 | 4172 | 2412 | 1645 | 900 | 193 | 105 | 58 | 78 |
| 2019 | 2326 | 6158 | 6393 | 2501 | 1592 | 1099 | 331 | 61 | 34 | 71 |
| 2020 | 2692 | 1574 | 4721 | 2433 | 791 | 427 | 226 | 69 | 13 | 52 |
| 2021 | 7213 | 2076 | 1613 | 2229 | 712 | 218 | 94 | 50 | 16 | 39 |
| 2022 | 6273 | 6174 | 1618 | 1223 | 935 | 215 | 65 | 30 | 24 | 33 |
| 2023 | 9104 | 5200 | 4254 | 1025 | 692 | 376 | 91 | 23 | 8 | 36 |
| 2024 | 8461 | 7869 | 3270 | 2599 | 690 | 454 | 194 | 56 | 13 | 34 |
| 2025 | 8609 | 6932 | 5720 | 2418 | 1735 | 418 | 304 | 100 | 24 | 33 |