| Table 2. Estimated stock numbers. | |||||||
| Year\Age | 0 | 1 | 2 | 3 | 4 | 5 | 6+ |
| 1985 | 848 | 759 | 476 | 267 | 142 | 71 | 48 |
| 1986 | 865 | 664 | 483 | 240 | 137 | 71 | 49 |
| 1987 | 891 | 681 | 418 | 236 | 122 | 67 | 49 |
| 1988 | 928 | 689 | 415 | 196 | 115 | 57 | 46 |
| 1989 | 948 | 726 | 395 | 175 | 86 | 51 | 40 |
| 1990 | 939 | 746 | 425 | 171 | 78 | 37 | 37 |
| 1991 | 956 | 736 | 439 | 181 | 84 | 37 | 33 |
| 1992 | 973 | 754 | 434 | 182 | 86 | 41 | 32 |
| 1993 | 959 | 772 | 449 | 184 | 88 | 42 | 33 |
| 1994 | 948 | 744 | 456 | 191 | 92 | 44 | 35 |
| 1995 | 928 | 735 | 427 | 185 | 90 | 46 | 37 |
| 1996 | 904 | 721 | 414 | 176 | 86 | 45 | 40 |
| 1997 | 889 | 708 | 409 | 177 | 83 | 43 | 42 |
| 1998 | 886 | 695 | 402 | 174 | 85 | 41 | 42 |
| 1999 | 887 | 690 | 380 | 164 | 83 | 42 | 40 |
| 2000 | 884 | 703 | 378 | 153 | 75 | 40 | 39 |
| 2001 | 887 | 712 | 390 | 156 | 70 | 35 | 37 |
| 2002 | 878 | 714 | 403 | 162 | 75 | 34 | 34 |
| 2003 | 903 | 694 | 394 | 162 | 79 | 37 | 33 |
| 2004 | 905 | 717 | 377 | 154 | 76 | 39 | 35 |
| 2005 | 872 | 722 | 393 | 154 | 74 | 37 | 36 |
| 2006 | 850 | 696 | 405 | 164 | 75 | 36 | 35 |
| 2007 | 813 | 681 | 393 | 173 | 80 | 36 | 32 |
| 2008 | 778 | 645 | 375 | 165 | 82 | 38 | 31 |
| 2009 | 761 | 621 | 349 | 155 | 76 | 40 | 35 |
| 2010 | 753 | 607 | 351 | 152 | 73 | 37 | 39 |
| 2011 | 736 | 600 | 357 | 159 | 71 | 36 | 40 |
| 2012 | 686 | 586 | 366 | 168 | 77 | 36 | 40 |
| 2013 | 641 | 554 | 365 | 171 | 83 | 41 | 40 |
| 2014 | 619 | 521 | 356 | 171 | 83 | 46 | 44 |
| 2015 | 608 | 503 | 346 | 172 | 82 | 45 | 50 |