| Table 3. Estimated stock numbers at age. | |||||||
| Year Age | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 
| 1981 | 10283 | 19689 | 7167 | 1975 | 392 | 56 | 49 | 
| 1982 | 25857 | 5124 | 7603 | 2546 | 728 | 165 | 37 | 
| 1983 | 15117 | 12234 | 2256 | 2796 | 881 | 255 | 66 | 
| 1984 | 24392 | 6592 | 4842 | 788 | 945 | 292 | 94 | 
| 1985 | 10914 | 11299 | 2415 | 1472 | 237 | 257 | 103 | 
| 1986 | 17565 | 4630 | 4167 | 742 | 343 | 66 | 88 | 
| 1987 | 46464 | 9117 | 1812 | 1345 | 226 | 96 | 42 | 
| 1988 | 6836 | 20019 | 3677 | 551 | 351 | 61 | 36 | 
| 1989 | 21394 | 2786 | 6615 | 1105 | 178 | 93 | 26 | 
| 1990 | 8442 | 9435 | 938 | 1685 | 303 | 45 | 29 | 
| 1991 | 12185 | 3397 | 3447 | 340 | 462 | 99 | 22 | 
| 1992 | 20452 | 5105 | 1074 | 1080 | 118 | 119 | 33 | 
| 1993 | 7128 | 8971 | 1804 | 293 | 310 | 36 | 43 | 
| 1994 | 14215 | 3306 | 3115 | 488 | 95 | 86 | 22 | 
| 1995 | 10472 | 5902 | 1254 | 1004 | 129 | 28 | 28 | 
| 1996 | 3938 | 4516 | 1836 | 365 | 295 | 39 | 15 | 
| 1997 | 15494 | 1737 | 1429 | 456 | 102 | 88 | 14 | 
| 1998 | 5300 | 6917 | 545 | 362 | 119 | 30 | 26 | 
| 1999 | 3664 | 2042 | 2069 | 133 | 96 | 38 | 16 | 
| 2000 | 12967 | 1542 | 563 | 518 | 36 | 27 | 15 | 
| 2001 | 3489 | 5308 | 496 | 164 | 159 | 10 | 11 | 
| 2002 | 6434 | 1479 | 1673 | 130 | 39 | 42 | 6 | 
| 2003 | 2032 | 2489 | 451 | 493 | 34 | 10 | 11 | 
| 2004 | 2962 | 789 | 630 | 105 | 137 | 10 | 5 | 
| 2005 | 1722 | 1079 | 224 | 178 | 30 | 29 | 3 | 
| 2006 | 6095 | 688 | 352 | 53 | 44 | 7 | 6 | 
| 2007 | 2106 | 2721 | 228 | 108 | 9 | 11 | 3 | 
| 2008 | 1368 | 739 | 920 | 59 | 27 | 2 | 3 | 
| 2009 | 4025 | 585 | 271 | 252 | 13 | 8 | 1 | 
| 2010 | 3440 | 1843 | 243 | 80 | 60 | 3 | 2 | 
| 2011 | 1356 | 1586 | 825 | 66 | 20 | 18 | 1 | 
| 2012 | 2956 | 601 | 784 | 188 | 10 | 5 | 4 | 
| 2013 | 3817 | 1312 | 326 | 273 | 41 | 3 | 2 | 
| 2014 | 3320 | 1609 | 604 | 146 | 83 | 8 | 1 | 
| 2015 | 2942 | 1471 | 754 | 184 | 64 | 35 | 2 | 
| 2016 | 1734 | 1534 | 663 | 329 | 62 | 21 | 11 | 
| 2017 | 1203 | 743 | 907 | 307 | 137 | 24 | 9 | 
| 2018 | 1061 | 574 | 277 | 353 | 128 | 52 | 9 | 
| 2019 | 3185 | 470 | 262 | 102 | 115 | 37 | 15 |