| Table 3. Estimated stock numbers at age. | |||||||
| Year Age | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 
| 1981 | 10353 | 19845 | 6993 | 1966 | 459 | 59 | 49 | 
| 1982 | 23714 | 5233 | 7824 | 2557 | 717 | 179 | 39 | 
| 1983 | 14108 | 11816 | 2199 | 2768 | 892 | 256 | 74 | 
| 1984 | 23792 | 6555 | 4615 | 766 | 894 | 298 | 102 | 
| 1985 | 10598 | 11400 | 2403 | 1447 | 235 | 266 | 115 | 
| 1986 | 20906 | 4647 | 4087 | 727 | 383 | 69 | 100 | 
| 1987 | 43867 | 10185 | 1733 | 1289 | 218 | 111 | 48 | 
| 1988 | 7215 | 19382 | 3704 | 521 | 356 | 64 | 44 | 
| 1989 | 21058 | 3064 | 6334 | 1123 | 156 | 103 | 31 | 
| 1990 | 8172 | 9457 | 1045 | 1693 | 326 | 45 | 37 | 
| 1991 | 11731 | 3457 | 3336 | 342 | 477 | 105 | 25 | 
| 1992 | 21163 | 5024 | 1089 | 1004 | 110 | 135 | 38 | 
| 1993 | 7586 | 9303 | 1700 | 299 | 289 | 35 | 51 | 
| 1994 | 13652 | 3393 | 3221 | 482 | 91 | 87 | 26 | 
| 1995 | 9882 | 5907 | 1212 | 982 | 138 | 28 | 32 | 
| 1996 | 4076 | 4330 | 1867 | 353 | 289 | 42 | 18 | 
| 1997 | 16223 | 1764 | 1377 | 487 | 102 | 88 | 17 | 
| 1998 | 5313 | 7160 | 537 | 358 | 135 | 30 | 29 | 
| 1999 | 4062 | 2129 | 2123 | 135 | 99 | 42 | 17 | 
| 2000 | 13661 | 1695 | 620 | 537 | 37 | 29 | 18 | 
| 2001 | 3956 | 5675 | 534 | 164 | 153 | 11 | 13 | 
| 2002 | 6564 | 1623 | 1780 | 139 | 41 | 42 | 7 | 
| 2003 | 2187 | 2644 | 475 | 475 | 38 | 11 | 13 | 
| 2004 | 3026 | 862 | 746 | 110 | 124 | 11 | 6 | 
| 2005 | 2118 | 1179 | 247 | 186 | 29 | 32 | 4 | 
| 2006 | 7041 | 842 | 381 | 57 | 45 | 7 | 9 | 
| 2007 | 2610 | 2992 | 271 | 99 | 13 | 12 | 4 | 
| 2008 | 1784 | 1014 | 1015 | 68 | 25 | 3 | 4 | 
| 2009 | 5473 | 725 | 337 | 245 | 15 | 7 | 2 | 
| 2010 | 6309 | 2331 | 252 | 80 | 55 | 4 | 2 | 
| 2011 | 2566 | 2728 | 834 | 61 | 19 | 15 | 2 | 
| 2012 | 4255 | 1112 | 1066 | 206 | 14 | 5 | 5 | 
| 2013 | 7641 | 1816 | 477 | 336 | 54 | 4 | 3 | 
| 2014 | 5865 | 3393 | 759 | 163 | 104 | 16 | 2 | 
| 2015 | 5458 | 2571 | 1483 | 248 | 55 | 37 | 6 | 
| 2016 | 2373 | 2545 | 1113 | 533 | 82 | 20 | 16 | 
| 2017 | 1849 | 1044 | 1194 | 400 | 186 | 30 | 13 | 
| 2018 | 1402 | 837 | 427 | 405 | 129 | 66 | 15 | 
| 2019 | 2785 | 594 | 344 | 132 | 118 | 41 | 27 |