| Table 3. Estimated stock numbers at age. | ||||||||
| Year Age | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 
| 1985 | 508072 | 203273 | 95963 | 24470 | 6307 | 3199 | 8397 | 1334 | 
| 1986 | 866405 | 133198 | 80585 | 30210 | 6184 | 1252 | 617 | 1333 | 
| 1987 | 461611 | 430862 | 68608 | 33694 | 10599 | 1882 | 385 | 499 | 
| 1988 | 493705 | 112213 | 146201 | 28306 | 10799 | 2961 | 442 | 234 | 
| 1989 | 518874 | 153173 | 29874 | 40714 | 9758 | 2367 | 513 | 106 | 
| 1990 | 679738 | 147654 | 59961 | 7979 | 10582 | 2743 | 392 | 82 | 
| 1991 | 892143 | 214986 | 46712 | 31977 | 2959 | 3318 | 707 | 106 | 
| 1992 | 697652 | 343881 | 85510 | 19865 | 14596 | 1238 | 928 | 215 | 
| 1993 | 694322 | 204580 | 131912 | 31746 | 7318 | 5177 | 407 | 315 | 
| 1994 | 722612 | 221537 | 78825 | 50911 | 11690 | 2599 | 1629 | 188 | 
| 1995 | 796629 | 230492 | 98117 | 35782 | 17451 | 3953 | 815 | 540 | 
| 1996 | 965921 | 247572 | 85933 | 33747 | 13113 | 5309 | 1162 | 286 | 
| 1997 | 766667 | 231972 | 67430 | 33414 | 10891 | 3470 | 1095 | 271 | 
| 1998 | 425644 | 279329 | 65458 | 19105 | 10127 | 2800 | 849 | 587 | 
| 1999 | 866278 | 103271 | 76063 | 15412 | 5026 | 2561 | 452 | 353 | 
| 2000 | 483700 | 438599 | 33735 | 16132 | 3131 | 1038 | 503 | 231 | 
| 2001 | 280115 | 110976 | 110878 | 11413 | 3789 | 779 | 220 | 102 | 
| 2002 | 361498 | 91909 | 42190 | 28326 | 3705 | 1097 | 165 | 95 | 
| 2003 | 205677 | 114900 | 22437 | 13730 | 7729 | 1250 | 374 | 61 | 
| 2004 | 131553 | 82649 | 31384 | 5534 | 3604 | 1995 | 312 | 161 | 
| 2005 | 119429 | 32418 | 21070 | 7559 | 1093 | 669 | 318 | 93 | 
| 2006 | 80400 | 37980 | 9899 | 7445 | 2582 | 328 | 298 | 113 | 
| 2007 | 47417 | 19304 | 13965 | 4659 | 2855 | 1062 | 195 | 224 | 
| 2008 | 52039 | 14143 | 6636 | 5749 | 2076 | 1182 | 418 | 196 | 
| 2009 | 237852 | 30080 | 6601 | 3234 | 3032 | 870 | 555 | 254 | 
| 2010 | 111454 | 112339 | 14577 | 3752 | 1625 | 1514 | 381 | 467 | 
| 2011 | 260123 | 24326 | 43097 | 7268 | 1874 | 808 | 838 | 301 | 
| 2012 | 109716 | 98032 | 11469 | 19831 | 3434 | 900 | 358 | 355 | 
| 2013 | 284612 | 40410 | 31044 | 6581 | 10134 | 1683 | 498 | 252 | 
| 2014 | 527765 | 123668 | 7340 | 9053 | 3575 | 3886 | 707 | 409 | 
| 2015 | 515816 | 141208 | 33756 | 6448 | 6064 | 2073 | 2294 | 587 | 
| 2016 | 336345 | 128834 | 74519 | 13710 | 3597 | 3037 | 1152 | 1317 | 
| 2017 | 351736 | 122671 | 44168 | 35445 | 5471 | 1890 | 1287 | 685 | 
| 2018 | 389639 | 73201 | 46191 | 19845 | 15480 | 2540 | 491 | 522 | 
| 2019 | 393738 | 155777 | 24911 | 19815 | 8530 | 5506 | 1264 | 286 | 
| 2020 | 393738 | 141181 | 66026 | 13780 | 12563 | 5519 | 3510 | 947 |