| Table 3. Estimated stock numbers at age. | |||||||
| Year Age | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 
| 1981 | 10467 | 19903 | 7021 | 1975 | 471 | 64 | 51 | 
| 1982 | 23381 | 5180 | 7745 | 2529 | 746 | 192 | 47 | 
| 1983 | 14618 | 11660 | 2212 | 2652 | 907 | 273 | 90 | 
| 1984 | 22508 | 6576 | 4682 | 745 | 871 | 310 | 123 | 
| 1985 | 10318 | 11000 | 2412 | 1391 | 232 | 255 | 133 | 
| 1986 | 18196 | 4525 | 4067 | 678 | 369 | 68 | 108 | 
| 1987 | 44062 | 9338 | 1748 | 1217 | 207 | 108 | 54 | 
| 1988 | 7600 | 19674 | 3546 | 495 | 329 | 61 | 47 | 
| 1989 | 18999 | 3110 | 6442 | 1054 | 153 | 94 | 33 | 
| 1990 | 8208 | 8926 | 1048 | 1626 | 310 | 45 | 36 | 
| 1991 | 11711 | 3422 | 3209 | 346 | 472 | 104 | 27 | 
| 1992 | 20307 | 5019 | 1064 | 963 | 114 | 132 | 41 | 
| 1993 | 7639 | 9223 | 1722 | 287 | 279 | 37 | 54 | 
| 1994 | 14375 | 3487 | 3270 | 478 | 90 | 84 | 28 | 
| 1995 | 10114 | 6263 | 1284 | 1007 | 137 | 28 | 34 | 
| 1996 | 4118 | 4537 | 1951 | 378 | 299 | 42 | 19 | 
| 1997 | 14823 | 1828 | 1392 | 501 | 108 | 89 | 17 | 
| 1998 | 5515 | 6961 | 527 | 362 | 135 | 30 | 29 | 
| 1999 | 4006 | 2227 | 1961 | 136 | 100 | 40 | 17 | 
| 2000 | 12998 | 1722 | 609 | 512 | 38 | 28 | 17 | 
| 2001 | 4065 | 5617 | 539 | 174 | 162 | 11 | 14 | 
| 2002 | 6775 | 1710 | 1712 | 147 | 44 | 45 | 7 | 
| 2003 | 2295 | 2831 | 481 | 468 | 42 | 12 | 14 | 
| 2004 | 3010 | 921 | 746 | 112 | 121 | 12 | 7 | 
| 2005 | 1906 | 1170 | 247 | 179 | 28 | 28 | 4 | 
| 2006 | 6878 | 749 | 386 | 51 | 42 | 7 | 7 | 
| 2007 | 2295 | 3143 | 248 | 99 | 10 | 10 | 4 | 
| 2008 | 1649 | 841 | 1138 | 58 | 27 | 2 | 4 | 
| 2009 | 5782 | 698 | 320 | 245 | 14 | 8 | 1 | 
| 2010 | 5441 | 2734 | 305 | 61 | 47 | 2 | 2 | 
| 2011 | 2241 | 2495 | 1191 | 67 | 14 | 13 | 1 | 
| 2012 | 4451 | 1000 | 1191 | 201 | 11 | 3 | 3 | 
| 2013 | 7694 | 1848 | 541 | 345 | 48 | 3 | 2 | 
| 2014 | 5855 | 3310 | 895 | 174 | 104 | 11 | 1 | 
| 2015 | 5159 | 2461 | 1520 | 236 | 56 | 35 | 4 | 
| 2016 | 2788 | 2482 | 1099 | 487 | 75 | 19 | 13 | 
| 2017 | 2127 | 1169 | 1440 | 417 | 184 | 28 | 12 | 
| 2018 | 1274 | 1009 | 462 | 458 | 131 | 62 | 13 | 
| 2019 | 2801 | 521 | 415 | 105 | 106 | 30 | 19 |