| Table 3. Estimated stock numbers at age. | |||||||
| Year Age | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 
| 1981 | 10412 | 19744 | 6997 | 1959 | 455 | 58 | 49 | 
| 1982 | 23038 | 5157 | 7699 | 2549 | 709 | 177 | 37 | 
| 1983 | 14408 | 11486 | 2181 | 2712 | 882 | 250 | 70 | 
| 1984 | 22284 | 6493 | 4559 | 765 | 857 | 290 | 95 | 
| 1985 | 10265 | 10841 | 2351 | 1444 | 230 | 243 | 105 | 
| 1986 | 18104 | 4496 | 3957 | 713 | 372 | 65 | 87 | 
| 1987 | 43452 | 9224 | 1704 | 1254 | 207 | 103 | 41 | 
| 1988 | 7615 | 19383 | 3455 | 511 | 326 | 58 | 38 | 
| 1989 | 18870 | 3130 | 6318 | 1073 | 151 | 89 | 26 | 
| 1990 | 8093 | 8848 | 1051 | 1688 | 309 | 43 | 30 | 
| 1991 | 11608 | 3392 | 3167 | 350 | 469 | 98 | 21 | 
| 1992 | 20263 | 4988 | 1060 | 965 | 112 | 128 | 33 | 
| 1993 | 7670 | 9183 | 1695 | 291 | 273 | 35 | 46 | 
| 1994 | 14271 | 3488 | 3232 | 482 | 89 | 81 | 23 | 
| 1995 | 10067 | 6201 | 1275 | 1011 | 136 | 28 | 28 | 
| 1996 | 4119 | 4480 | 1946 | 375 | 293 | 41 | 16 | 
| 1997 | 14825 | 1809 | 1399 | 500 | 106 | 88 | 15 | 
| 1998 | 5524 | 6850 | 540 | 361 | 134 | 30 | 27 | 
| 1999 | 4020 | 2206 | 2004 | 135 | 98 | 40 | 16 | 
| 2000 | 12896 | 1708 | 627 | 510 | 37 | 28 | 16 | 
| 2001 | 3993 | 5524 | 551 | 174 | 156 | 11 | 12 | 
| 2002 | 6587 | 1663 | 1745 | 146 | 43 | 43 | 6 | 
| 2003 | 2232 | 2729 | 490 | 464 | 40 | 11 | 12 | 
| 2004 | 2972 | 886 | 750 | 112 | 115 | 11 | 6 | 
| 2005 | 1902 | 1153 | 246 | 184 | 28 | 27 | 3 | 
| 2006 | 6792 | 746 | 385 | 54 | 42 | 7 | 6 | 
| 2007 | 2231 | 3077 | 247 | 106 | 10 | 10 | 3 | 
| 2008 | 1636 | 819 | 1103 | 63 | 27 | 2 | 3 | 
| 2009 | 5644 | 691 | 299 | 260 | 13 | 7 | 1 | 
| 2010 | 5425 | 2628 | 290 | 68 | 46 | 2 | 2 | 
| 2011 | 2233 | 2468 | 1091 | 70 | 13 | 13 | 1 | 
| 2012 | 4375 | 983 | 1120 | 218 | 10 | 4 | 3 | 
| 2013 | 7592 | 1820 | 509 | 360 | 46 | 3 | 2 | 
| 2014 | 5821 | 3291 | 859 | 182 | 99 | 11 | 1 | 
| 2015 | 5141 | 2471 | 1495 | 249 | 54 | 32 | 3 | 
| 2016 | 2789 | 2488 | 1104 | 513 | 73 | 17 | 11 | 
| 2017 | 2147 | 1193 | 1420 | 429 | 177 | 26 | 8 | 
| 2018 | 1276 | 1026 | 485 | 485 | 127 | 57 | 10 | 
| 2019 | 2754 | 526 | 436 | 134 | 113 | 30 | 15 |