| Table 3. Estimated stock numbers at age. | |||||||
| Year Age | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 
| 1985 | 285154 | 87945 | 22050 | 5442 | 2627 | 7254 | 1418 | 
| 1986 | 278618 | 75130 | 32043 | 6431 | 1256 | 535 | 1667 | 
| 1987 | 386140 | 78241 | 28639 | 10256 | 1718 | 304 | 515 | 
| 1988 | 125644 | 106333 | 28757 | 8496 | 2493 | 372 | 169 | 
| 1989 | 277145 | 33776 | 37569 | 7863 | 1857 | 471 | 96 | 
| 1990 | 182807 | 77732 | 12277 | 10841 | 1879 | 388 | 111 | 
| 1991 | 250878 | 55004 | 29924 | 3980 | 3085 | 485 | 123 | 
| 1992 | 347078 | 78047 | 21635 | 10129 | 1214 | 869 | 165 | 
| 1993 | 240615 | 110162 | 30976 | 7448 | 3189 | 357 | 294 | 
| 1994 | 261596 | 77878 | 44131 | 10823 | 2396 | 966 | 193 | 
| 1995 | 243140 | 85399 | 31174 | 15386 | 3476 | 730 | 345 | 
| 1996 | 177801 | 76894 | 32842 | 10085 | 4490 | 960 | 290 | 
| 1997 | 161109 | 53167 | 27760 | 9464 | 2545 | 1070 | 292 | 
| 1998 | 174635 | 47159 | 18678 | 7664 | 2290 | 589 | 313 | 
| 1999 | 123370 | 47003 | 15163 | 4387 | 1529 | 438 | 172 | 
| 2000 | 244734 | 31605 | 14335 | 3229 | 776 | 261 | 103 | 
| 2001 | 95229 | 60342 | 9255 | 2843 | 521 | 121 | 56 | 
| 2002 | 42838 | 25612 | 19247 | 2178 | 569 | 103 | 34 | 
| 2003 | 60663 | 11737 | 8318 | 4768 | 473 | 124 | 30 | 
| 2004 | 47264 | 17010 | 3902 | 2173 | 1115 | 112 | 37 | 
| 2005 | 22975 | 12532 | 5352 | 931 | 457 | 235 | 31 | 
| 2006 | 23732 | 6961 | 4513 | 1621 | 260 | 127 | 73 | 
| 2007 | 11654 | 7620 | 2662 | 1520 | 507 | 80 | 60 | 
| 2008 | 11342 | 3812 | 2976 | 937 | 493 | 160 | 42 | 
| 2009 | 18758 | 3775 | 1519 | 1097 | 318 | 161 | 62 | 
| 2010 | 40724 | 6012 | 1451 | 540 | 353 | 97 | 64 | 
| 2011 | 11929 | 12215 | 2167 | 477 | 156 | 95 | 39 | 
| 2012 | 19741 | 3865 | 4763 | 819 | 165 | 51 | 40 | 
| 2013 | 9442 | 6417 | 1513 | 1843 | 294 | 57 | 29 | 
| 2014 | 19609 | 3043 | 2491 | 589 | 671 | 103 | 28 | 
| 2015 | 43352 | 6759 | 1263 | 1061 | 240 | 266 | 50 | 
| 2016 | 34205 | 14772 | 2772 | 528 | 423 | 92 | 116 | 
| 2017 | 31789 | 11795 | 6128 | 1174 | 215 | 166 | 79 | 
| 2018 | 21201 | 11081 | 4944 | 2623 | 488 | 86 | 96 | 
| 2019 | 49475 | 7675 | 4823 | 2215 | 1169 | 212 | 78 | 
| 2020 | 44984 | 18084 | 3373 | 2176 | 1009 | 521 | 129 |