| Table 3. Estimated stock numbers at age. | |||||||
| Year Age | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 
| 1981 | 9733 | 20166 | 7018 | 1974 | 467 | 64 | 51 | 
| 1982 | 23455 | 5168 | 7806 | 2533 | 749 | 195 | 47 | 
| 1983 | 14270 | 12099 | 2215 | 2685 | 910 | 273 | 91 | 
| 1984 | 23130 | 6590 | 4790 | 749 | 885 | 310 | 123 | 
| 1985 | 10580 | 11331 | 2423 | 1420 | 232 | 259 | 132 | 
| 1986 | 18989 | 4484 | 4115 | 685 | 366 | 68 | 105 | 
| 1987 | 46208 | 9653 | 1735 | 1248 | 211 | 106 | 53 | 
| 1988 | 6976 | 19386 | 3584 | 492 | 337 | 62 | 46 | 
| 1989 | 18961 | 2708 | 6125 | 1029 | 149 | 94 | 32 | 
| 1990 | 7200 | 7868 | 874 | 1417 | 277 | 40 | 33 | 
| 1991 | 9770 | 2655 | 2590 | 264 | 365 | 84 | 22 | 
| 1992 | 17304 | 3926 | 827 | 789 | 89 | 101 | 33 | 
| 1993 | 6057 | 7547 | 1392 | 231 | 235 | 30 | 44 | 
| 1994 | 12189 | 2835 | 2731 | 402 | 75 | 72 | 24 | 
| 1995 | 8659 | 5402 | 1078 | 868 | 118 | 24 | 29 | 
| 1996 | 3586 | 3990 | 1703 | 325 | 262 | 37 | 16 | 
| 1997 | 14221 | 1650 | 1260 | 443 | 95 | 79 | 15 | 
| 1998 | 4931 | 6753 | 488 | 331 | 123 | 27 | 26 | 
| 1999 | 3582 | 2013 | 1906 | 126 | 92 | 38 | 16 | 
| 2000 | 12606 | 1559 | 560 | 492 | 35 | 26 | 16 | 
| 2001 | 3766 | 5293 | 488 | 158 | 148 | 10 | 13 | 
| 2002 | 6598 | 1562 | 1617 | 131 | 39 | 40 | 7 | 
| 2003 | 2208 | 2588 | 437 | 446 | 38 | 10 | 12 | 
| 2004 | 2935 | 832 | 680 | 100 | 116 | 11 | 6 | 
| 2005 | 1741 | 1069 | 226 | 167 | 27 | 27 | 4 | 
| 2006 | 6847 | 657 | 355 | 48 | 40 | 6 | 7 | 
| 2007 | 1931 | 3072 | 217 | 96 | 9 | 10 | 3 | 
| 2008 | 1374 | 739 | 1058 | 52 | 27 | 2 | 3 | 
| 2009 | 5234 | 619 | 284 | 232 | 13 | 8 | 1 | 
| 2010 | 5346 | 2530 | 262 | 58 | 43 | 2 | 2 | 
| 2011 | 2299 | 2577 | 1022 | 57 | 14 | 11 | 1 | 
| 2012 | 4230 | 1082 | 1158 | 205 | 12 | 4 | 3 | 
| 2013 | 7539 | 1864 | 530 | 318 | 50 | 3 | 2 | 
| 2014 | 5946 | 3442 | 837 | 158 | 94 | 13 | 1 | 
| 2015 | 5466 | 2652 | 1614 | 235 | 52 | 31 | 4 | 
| 2016 | 2393 | 2659 | 1200 | 525 | 73 | 18 | 12 | 
| 2017 | 1952 | 1056 | 1358 | 390 | 178 | 25 | 10 | 
| 2018 | 1351 | 915 | 438 | 400 | 115 | 56 | 11 | 
| 2019 | 2968 | 573 | 389 | 107 | 101 | 29 | 18 |