| Table 3. Estimated stock numbers at age. | |||||||
| Year Age | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 
| 1981 | 10222 | 19971 | 7015 | 1976 | 472 | 64 | 52 | 
| 1982 | 24053 | 5245 | 7774 | 2537 | 750 | 193 | 47 | 
| 1983 | 14246 | 12100 | 2222 | 2681 | 911 | 274 | 90 | 
| 1984 | 23922 | 6644 | 4794 | 747 | 890 | 312 | 124 | 
| 1985 | 10605 | 11577 | 2491 | 1416 | 232 | 266 | 135 | 
| 1986 | 20819 | 4645 | 4255 | 702 | 375 | 68 | 112 | 
| 1987 | 45801 | 10205 | 1786 | 1268 | 216 | 110 | 55 | 
| 1988 | 7259 | 19803 | 3800 | 511 | 354 | 64 | 49 | 
| 1989 | 21713 | 2997 | 6511 | 1117 | 158 | 103 | 35 | 
| 1990 | 8577 | 9483 | 1040 | 1648 | 324 | 46 | 40 | 
| 1991 | 12170 | 3464 | 3368 | 341 | 478 | 108 | 28 | 
| 1992 | 21574 | 5040 | 1087 | 1013 | 113 | 136 | 43 | 
| 1993 | 7527 | 9361 | 1736 | 295 | 295 | 36 | 56 | 
| 1994 | 13955 | 3407 | 3295 | 480 | 90 | 87 | 28 | 
| 1995 | 10005 | 6099 | 1243 | 993 | 137 | 28 | 34 | 
| 1996 | 4132 | 4496 | 1912 | 364 | 296 | 42 | 19 | 
| 1997 | 16636 | 1853 | 1405 | 499 | 105 | 88 | 17 | 
| 1998 | 5460 | 7652 | 543 | 371 | 139 | 30 | 30 | 
| 1999 | 4152 | 2260 | 2158 | 142 | 105 | 43 | 18 | 
| 2000 | 14309 | 1790 | 631 | 564 | 39 | 30 | 18 | 
| 2001 | 4189 | 6016 | 547 | 173 | 164 | 11 | 14 | 
| 2002 | 7128 | 1735 | 1816 | 145 | 44 | 44 | 7 | 
| 2003 | 2378 | 2849 | 484 | 502 | 42 | 12 | 14 | 
| 2004 | 3273 | 927 | 768 | 115 | 135 | 12 | 7 | 
| 2005 | 2195 | 1254 | 260 | 191 | 31 | 33 | 5 | 
| 2006 | 7249 | 870 | 418 | 56 | 46 | 7 | 9 | 
| 2007 | 2565 | 3125 | 296 | 101 | 12 | 11 | 4 | 
| 2008 | 1773 | 1010 | 1152 | 68 | 26 | 3 | 4 | 
| 2009 | 5581 | 742 | 376 | 247 | 15 | 6 | 2 | 
| 2010 | 6144 | 2483 | 296 | 75 | 52 | 3 | 2 | 
| 2011 | 2533 | 2744 | 1018 | 60 | 16 | 12 | 1 | 
| 2012 | 4336 | 1132 | 1223 | 202 | 12 | 4 | 3 | 
| 2013 | 7862 | 1858 | 545 | 323 | 50 | 3 | 2 | 
| 2014 | 6114 | 3467 | 844 | 160 | 95 | 13 | 1 | 
| 2015 | 5881 | 2646 | 1623 | 239 | 51 | 31 | 5 | 
| 2016 | 2513 | 2706 | 1209 | 520 | 76 | 17 | 12 | 
| 2017 | 2080 | 1081 | 1352 | 395 | 177 | 26 | 10 | 
| 2018 | 1435 | 935 | 464 | 406 | 120 | 57 | 12 | 
| 2019 | 3017 | 603 | 408 | 120 | 109 | 33 | 19 |