| Table 3. Estimated stock numbers at age. | ||||||||
| Year Age | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 
| 1981 | 866430 | 146039 | 386867 | 75159 | 20801 | 5852 | 1606 | 681 | 
| 1982 | 950328 | 293817 | 62252 | 182264 | 32527 | 8255 | 2372 | 947 | 
| 1983 | 1072263 | 286038 | 79291 | 30627 | 80941 | 13512 | 3274 | 1215 | 
| 1984 | 717329 | 362027 | 75893 | 25643 | 11066 | 29431 | 4059 | 1442 | 
| 1985 | 487670 | 225225 | 101182 | 24835 | 6816 | 3121 | 7764 | 1318 | 
| 1986 | 1056869 | 137689 | 88368 | 32570 | 6343 | 1345 | 625 | 1379 | 
| 1987 | 399779 | 464102 | 68401 | 34594 | 10860 | 1889 | 405 | 519 | 
| 1988 | 609780 | 111570 | 148774 | 28244 | 10730 | 2972 | 438 | 239 | 
| 1989 | 464673 | 178201 | 30420 | 41897 | 9534 | 2323 | 515 | 106 | 
| 1990 | 547579 | 149676 | 68361 | 8327 | 10795 | 2673 | 390 | 84 | 
| 1991 | 768703 | 203021 | 50403 | 35338 | 3047 | 3354 | 701 | 107 | 
| 1992 | 560167 | 324659 | 84014 | 20443 | 14919 | 1200 | 917 | 214 | 
| 1993 | 657184 | 187810 | 126217 | 31480 | 7358 | 5246 | 388 | 312 | 
| 1994 | 655388 | 215920 | 75846 | 49610 | 11578 | 2544 | 1628 | 185 | 
| 1995 | 682699 | 222165 | 96287 | 34835 | 17187 | 3877 | 791 | 537 | 
| 1996 | 831603 | 228602 | 85879 | 33893 | 12865 | 5201 | 1117 | 287 | 
| 1997 | 715038 | 214802 | 65384 | 33004 | 10667 | 3348 | 1066 | 265 | 
| 1998 | 303193 | 268804 | 61761 | 18797 | 9945 | 2749 | 815 | 543 | 
| 1999 | 885623 | 90255 | 78495 | 15380 | 4986 | 2534 | 461 | 328 | 
| 2000 | 354729 | 409758 | 31950 | 16721 | 3157 | 1026 | 479 | 212 | 
| 2001 | 254116 | 96299 | 99152 | 10681 | 3747 | 731 | 208 | 95 | 
| 2002 | 380024 | 82480 | 38584 | 26511 | 3497 | 1057 | 151 | 85 | 
| 2003 | 198657 | 107338 | 20441 | 12622 | 7182 | 1150 | 347 | 55 | 
| 2004 | 129279 | 75782 | 28287 | 5181 | 3391 | 1862 | 287 | 146 | 
| 2005 | 127097 | 30793 | 19354 | 7053 | 1048 | 650 | 303 | 88 | 
| 2006 | 85943 | 36848 | 9114 | 6812 | 2416 | 327 | 288 | 114 | 
| 2007 | 51913 | 19089 | 12483 | 4193 | 2602 | 979 | 181 | 214 | 
| 2008 | 50973 | 14240 | 6321 | 5276 | 1916 | 1103 | 391 | 185 | 
| 2009 | 275026 | 28752 | 6489 | 3145 | 2961 | 832 | 529 | 240 | 
| 2010 | 88364 | 111166 | 13247 | 3467 | 1508 | 1410 | 360 | 432 | 
| 2011 | 327662 | 22465 | 40248 | 6587 | 1724 | 733 | 751 | 284 | 
| 2012 | 96673 | 98222 | 10323 | 17262 | 3137 | 845 | 334 | 335 | 
| 2013 | 283570 | 37412 | 29441 | 5951 | 9121 | 1553 | 471 | 247 | 
| 2014 | 443382 | 115325 | 7199 | 8871 | 3343 | 3756 | 690 | 400 | 
| 2015 | 462370 | 129902 | 32019 | 5898 | 5615 | 1914 | 2160 | 578 | 
| 2016 | 320282 | 118983 | 64828 | 12490 | 3259 | 2778 | 1050 | 1231 | 
| 2017 | 354155 | 114997 | 40177 | 31065 | 5007 | 1751 | 1203 | 659 | 
| 2018 | 395933 | 72427 | 43158 | 18289 | 14045 | 2400 | 495 | 521 | 
| 2019 | 374393 | 150730 | 24133 | 18827 | 8143 | 5344 | 1235 | 300 | 
| 2020 | 543318 | 132705 | 62910 | 12980 | 11527 | 5135 | 3329 | 938 |