| Table 3. Estimated stock numbers at age. | ||||||
| Year Age | 1 | 2 | 3 | 4 | 5 | 6 |
| 1963 | 399013 | 169038 | 20023 | 10230 | 8122 | 4995 |
| 1964 | 652239 | 120471 | 51725 | 11480 | 5207 | 6808 |
| 1965 | 874348 | 206339 | 40432 | 22910 | 6185 | 5355 |
| 1966 | 1062846 | 252476 | 67769 | 16356 | 9349 | 5981 |
| 1967 | 892448 | 308751 | 72981 | 28546 | 8011 | 7988 |
| 1968 | 448856 | 264129 | 90259 | 28800 | 14318 | 6892 |
| 1969 | 392647 | 127508 | 72262 | 34027 | 11350 | 9810 |
| 1970 | 1321405 | 118652 | 38852 | 32189 | 15317 | 8189 |
| 1971 | 1737071 | 383873 | 33653 | 14952 | 16036 | 10385 |
| 1972 | 429631 | 479615 | 91039 | 12157 | 5976 | 12650 |
| 1973 | 634560 | 108940 | 106050 | 29991 | 4959 | 6982 |
| 1974 | 630023 | 163501 | 23669 | 36415 | 10950 | 5480 |
| 1975 | 1085396 | 157608 | 36878 | 9685 | 16404 | 7024 |
| 1976 | 751097 | 272423 | 34068 | 13684 | 3798 | 9696 |
| 1977 | 1830282 | 165736 | 51169 | 10800 | 5108 | 6039 |
| 1978 | 1119151 | 429770 | 30923 | 18827 | 5654 | 4536 |
| 1979 | 1396917 | 258039 | 80992 | 8908 | 7331 | 3443 |
| 1980 | 2253495 | 301232 | 59338 | 24572 | 3970 | 4591 |
| 1981 | 876433 | 481636 | 59305 | 17615 | 8764 | 3550 |
| 1982 | 1452729 | 182772 | 93787 | 17008 | 6579 | 5532 |
| 1983 | 800247 | 312796 | 33549 | 21227 | 5386 | 4414 |
| 1984 | 1484826 | 173961 | 52551 | 7968 | 6718 | 3770 |
| 1985 | 352329 | 330457 | 33335 | 14711 | 2753 | 4125 |
| 1986 | 1621665 | 83902 | 58648 | 10187 | 5606 | 2941 |
| 1987 | 618752 | 384569 | 16664 | 15430 | 2991 | 3313 |
| 1988 | 427497 | 150548 | 71709 | 5267 | 4921 | 2320 |
| 1989 | 754927 | 106120 | 30823 | 17400 | 1828 | 2914 |
| 1990 | 297074 | 182171 | 20575 | 7890 | 5111 | 1653 |
| 1991 | 341879 | 75160 | 31079 | 6035 | 2694 | 2952 |
| 1992 | 815806 | 90832 | 15246 | 8877 | 2038 | 2043 |
| 1993 | 402776 | 205191 | 18502 | 5083 | 2871 | 1588 |
| 1994 | 983436 | 108699 | 37648 | 5592 | 1748 | 1726 |
| 1995 | 566335 | 256184 | 24410 | 10510 | 1826 | 1325 |
| 1996 | 359472 | 144414 | 41899 | 5772 | 3408 | 1434 |
| 1997 | 1140000 | 102045 | 27403 | 9743 | 1887 | 1703 |
| 1998 | 113586 | 313951 | 22461 | 7203 | 3113 | 1263 |
| 1999 | 236187 | 33306 | 57065 | 5614 | 2101 | 1597 |
| 2000 | 436576 | 67955 | 8772 | 10032 | 1518 | 1080 |
| 2001 | 157174 | 129782 | 14667 | 2217 | 2301 | 748 |
| 2002 | 240991 | 49342 | 26524 | 3930 | 604 | 962 |
| 2003 | 115771 | 68904 | 11300 | 7331 | 1105 | 540 |
| 2004 | 201847 | 37773 | 14782 | 3096 | 2038 | 587 |
| 2005 | 154721 | 55399 | 8509 | 3434 | 1011 | 1067 |
| 2006 | 365773 | 48072 | 13200 | 2232 | 1113 | 941 |
| 2007 | 171281 | 104888 | 10614 | 4220 | 988 | 815 |
| 2008 | 194806 | 48353 | 25036 | 3239 | 1655 | 1005 |
| 2009 | 185642 | 55091 | 11901 | 7732 | 1422 | 1156 |
| 2010 | 282433 | 55271 | 13672 | 3997 | 3260 | 1091 |
| 2011 | 135370 | 79925 | 13907 | 4329 | 1744 | 2179 |
| 2012 | 183650 | 40700 | 20838 | 6019 | 1949 | 1904 |
| 2013 | 232997 | 51608 | 11647 | 8834 | 2950 | 1848 |
| 2014 | 331414 | 65717 | 16140 | 5146 | 4277 | 2325 |
| 2015 | 164836 | 96047 | 21239 | 6670 | 2491 | 4010 |
| 2016 | 116525 | 43970 | 28499 | 10815 | 3487 | 3035 |
| 2017 | 562982 | 29524 | 14290 | 12825 | 5960 | 3488 |
| 2018 | 562982 | 149625 | 9046 | 6637 | 6942 | 5602 |