| Table 3. Estimated stock numbers at age. | ||||||||
| Year Age | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| 1985 | 865497 | 336472 | 112045 | 27100 | 7221 | 3488 | 8356 | 1299 |
| 1986 | 1457187 | 275771 | 112275 | 36040 | 6880 | 1434 | 638 | 1466 |
| 1987 | 429863 | 528812 | 100211 | 40834 | 12261 | 1942 | 463 | 543 |
| 1988 | 823636 | 128007 | 171848 | 32805 | 11753 | 3266 | 451 | 201 |
| 1989 | 668957 | 275617 | 36912 | 46735 | 9974 | 2364 | 630 | 98 |
| 1990 | 925751 | 209507 | 97696 | 9903 | 11366 | 2555 | 409 | 104 |
| 1991 | 1023884 | 310166 | 68250 | 45202 | 3522 | 3465 | 693 | 125 |
| 1992 | 657675 | 345165 | 105156 | 23953 | 16234 | 1081 | 860 | 199 |
| 1993 | 805755 | 210385 | 118436 | 34403 | 8296 | 5958 | 350 | 302 |
| 1994 | 759767 | 270220 | 74272 | 45100 | 11792 | 2544 | 1790 | 180 |
| 1995 | 562604 | 255397 | 102766 | 32564 | 15431 | 3620 | 795 | 583 |
| 1996 | 509510 | 182294 | 91873 | 35571 | 12375 | 4438 | 1047 | 375 |
| 1997 | 607684 | 160132 | 55174 | 33178 | 10638 | 3107 | 860 | 314 |
| 1998 | 337170 | 201296 | 52036 | 18353 | 10771 | 2934 | 766 | 333 |
| 1999 | 757028 | 97087 | 59400 | 13581 | 4899 | 3011 | 590 | 262 |
| 2000 | 317094 | 246553 | 27659 | 14458 | 3096 | 993 | 517 | 159 |
| 2001 | 152230 | 93349 | 68149 | 8641 | 3428 | 657 | 191 | 114 |
| 2002 | 207266 | 44604 | 27722 | 16912 | 2620 | 798 | 103 | 60 |
| 2003 | 145694 | 64597 | 11636 | 8351 | 4696 | 800 | 219 | 45 |
| 2004 | 80119 | 48925 | 18372 | 3448 | 2410 | 1251 | 184 | 83 |
| 2005 | 79245 | 22704 | 13414 | 5244 | 815 | 525 | 221 | 73 |
| 2006 | 45736 | 25142 | 7363 | 5119 | 2089 | 305 | 222 | 120 |
| 2007 | 43978 | 14011 | 9050 | 3174 | 2061 | 826 | 133 | 149 |
| 2008 | 57537 | 14430 | 4698 | 4026 | 1424 | 867 | 343 | 129 |
| 2009 | 205972 | 19539 | 5149 | 2096 | 1995 | 621 | 378 | 233 |
| 2010 | 52083 | 73048 | 8156 | 2328 | 970 | 956 | 281 | 310 |
| 2011 | 129058 | 15257 | 25610 | 3832 | 1044 | 432 | 454 | 287 |
| 2012 | 45408 | 45963 | 6498 | 11553 | 2145 | 547 | 231 | 395 |
| 2013 | 154511 | 13933 | 16233 | 3543 | 5656 | 1138 | 284 | 341 |
| 2014 | 322698 | 51244 | 5072 | 6536 | 2094 | 2782 | 630 | 350 |
| 2015 | 210276 | 111761 | 17702 | 3176 | 3473 | 1212 | 1595 | 573 |
| 2016 | 202229 | 68997 | 44474 | 7644 | 1768 | 1806 | 687 | 1223 |
| 2017 | 146679 | 70992 | 26320 | 20989 | 3775 | 1012 | 1004 | 1080 |
| 2018 | 288844 | 45963 | 28883 | 13231 | 10575 | 2132 | 459 | 1206 |
| 2019 | 272006 | 101723 | 17746 | 14644 | 7430 | 5392 | 1239 | 968 |
| 2020 | 272006 | 92250 | 40986 | 8971 | 8048 | 4273 | 3122 | 1346 |