| Table 3. Estimated stock numbers at age. | |||||||
| Year Age | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 
| 1981 | 9733 | 20211 | 7020 | 1975 | 467 | 65 | 51 | 
| 1982 | 23502 | 5153 | 7808 | 2536 | 751 | 196 | 48 | 
| 1983 | 14339 | 12111 | 2218 | 2693 | 912 | 275 | 92 | 
| 1984 | 23231 | 6609 | 4816 | 753 | 891 | 312 | 123 | 
| 1985 | 10676 | 11425 | 2440 | 1437 | 235 | 261 | 133 | 
| 1986 | 19234 | 4532 | 4166 | 693 | 371 | 69 | 107 | 
| 1987 | 47606 | 9841 | 1761 | 1274 | 216 | 108 | 54 | 
| 1988 | 7358 | 20213 | 3703 | 505 | 348 | 64 | 48 | 
| 1989 | 21286 | 2924 | 6556 | 1103 | 158 | 100 | 35 | 
| 1990 | 8918 | 9264 | 1002 | 1642 | 322 | 46 | 38 | 
| 1991 | 12383 | 3479 | 3323 | 340 | 471 | 109 | 28 | 
| 1992 | 21382 | 5015 | 1069 | 1014 | 115 | 130 | 43 | 
| 1993 | 7315 | 9294 | 1744 | 287 | 293 | 37 | 55 | 
| 1994 | 14678 | 3403 | 3311 | 488 | 90 | 88 | 29 | 
| 1995 | 10674 | 6481 | 1290 | 1044 | 141 | 29 | 35 | 
| 1996 | 4376 | 4967 | 2099 | 402 | 327 | 46 | 20 | 
| 1997 | 16661 | 1990 | 1530 | 531 | 114 | 95 | 18 | 
| 1998 | 5635 | 7839 | 568 | 386 | 142 | 32 | 30 | 
| 1999 | 4037 | 2282 | 2160 | 143 | 105 | 43 | 18 | 
| 2000 | 14126 | 1748 | 627 | 552 | 39 | 29 | 18 | 
| 2001 | 4218 | 5921 | 544 | 178 | 166 | 11 | 14 | 
| 2002 | 7274 | 1743 | 1795 | 145 | 44 | 44 | 7 | 
| 2003 | 2408 | 2850 | 480 | 494 | 41 | 11 | 13 | 
| 2004 | 3126 | 905 | 735 | 109 | 127 | 12 | 6 | 
| 2005 | 1822 | 1132 | 240 | 178 | 28 | 29 | 4 | 
| 2006 | 7022 | 680 | 369 | 50 | 42 | 7 | 7 | 
| 2007 | 1973 | 3131 | 221 | 97 | 9 | 10 | 3 | 
| 2008 | 1400 | 748 | 1073 | 53 | 27 | 2 | 3 | 
| 2009 | 5342 | 627 | 287 | 235 | 13 | 8 | 1 | 
| 2010 | 5397 | 2577 | 266 | 59 | 43 | 2 | 2 | 
| 2011 | 2301 | 2589 | 1042 | 57 | 14 | 11 | 1 | 
| 2012 | 4255 | 1081 | 1169 | 207 | 12 | 4 | 3 | 
| 2013 | 7557 | 1868 | 534 | 321 | 50 | 3 | 2 | 
| 2014 | 5976 | 3442 | 843 | 160 | 95 | 13 | 1 | 
| 2015 | 5481 | 2656 | 1620 | 236 | 52 | 32 | 4 | 
| 2016 | 2413 | 2665 | 1205 | 527 | 74 | 18 | 12 | 
| 2017 | 1964 | 1062 | 1371 | 393 | 179 | 25 | 10 | 
| 2018 | 1360 | 923 | 440 | 404 | 116 | 56 | 11 | 
| 2019 | 2981 | 576 | 393 | 107 | 101 | 29 | 18 |