| Table 3. Estimated stock numbers at age. | ||||||||
| Year Age | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| 1986 | 4694 | 4034 | 3397 | 3076 | 2300 | 1609 | 1811 | 2240 |
| 1987 | 4094 | 3997 | 3283 | 2651 | 2291 | 1679 | 1165 | 2961 |
| 1988 | 3026 | 3492 | 3277 | 2616 | 2066 | 1767 | 1281 | 3149 |
| 1989 | 2887 | 2574 | 2826 | 2564 | 2011 | 1584 | 1342 | 3362 |
| 1990 | 3526 | 2440 | 2015 | 2088 | 1829 | 1412 | 1084 | 3245 |
| 1991 | 5768 | 2984 | 1914 | 1484 | 1487 | 1293 | 970 | 2977 |
| 1992 | 12035 | 4882 | 2331 | 1384 | 1030 | 1027 | 862 | 2636 |
| 1993 | 12454 | 10174 | 3767 | 1624 | 930 | 702 | 680 | 2299 |
| 1994 | 11377 | 10532 | 7807 | 2546 | 1077 | 638 | 473 | 1979 |
| 1995 | 9939 | 9653 | 8206 | 5392 | 1733 | 759 | 446 | 1689 |
| 1996 | 6772 | 8446 | 7564 | 5683 | 3624 | 1202 | 522 | 1445 |
| 1997 | 4475 | 5772 | 6731 | 5416 | 3885 | 2494 | 816 | 1317 |
| 1998 | 3612 | 3807 | 4534 | 4663 | 3528 | 2503 | 1573 | 1343 |
| 1999 | 5396 | 3076 | 3007 | 3174 | 2952 | 2078 | 1358 | 1559 |
| 2000 | 7574 | 4600 | 2446 | 2142 | 2049 | 1769 | 1165 | 1676 |
| 2001 | 8102 | 6479 | 3763 | 1876 | 1571 | 1452 | 1211 | 2006 |
| 2002 | 8533 | 6921 | 5225 | 2782 | 1326 | 1078 | 955 | 2197 |
| 2003 | 7757 | 7274 | 5486 | 3665 | 1825 | 848 | 663 | 2042 |
| 2004 | 8289 | 6599 | 5679 | 3732 | 2276 | 1093 | 487 | 1637 |
| 2005 | 10544 | 7035 | 5064 | 3756 | 2264 | 1336 | 632 | 1301 |
| 2006 | 13151 | 8970 | 5514 | 3560 | 2475 | 1445 | 833 | 1253 |
| 2007 | 13812 | 11202 | 7105 | 3977 | 2417 | 1600 | 880 | 1281 |
| 2008 | 13267 | 11790 | 9016 | 5293 | 2855 | 1679 | 1057 | 1437 |
| 2009 | 11944 | 11328 | 9505 | 6707 | 3745 | 1912 | 1013 | 1464 |
| 2010 | 11880 | 10213 | 9239 | 7278 | 4899 | 2595 | 1177 | 1429 |
| 2011 | 12216 | 10156 | 8314 | 7053 | 5317 | 3421 | 1643 | 1568 |
| 2012 | 11405 | 10459 | 8361 | 6500 | 5277 | 3785 | 2195 | 1908 |
| 2013 | 9828 | 9759 | 8568 | 6448 | 4773 | 3652 | 2315 | 2304 |
| 2014 | 10334 | 8400 | 7917 | 6430 | 4548 | 3127 | 2065 | 2321 |
| 2015 | 11636 | 8843 | 6869 | 6024 | 4638 | 3105 | 1928 | 2480 |
| 2016 | 11165 | 9947 | 7170 | 5117 | 4198 | 3060 | 1845 | 2363 |
| 2017 | 12951 | 9536 | 8002 | 5258 | 3558 | 2746 | 1769 | 2118 |
| 2018 | 12066 | 11046 | 7603 | 5815 | 3688 | 2405 | 1634 | 2006 |
| 2019 | 15042 | 10282 | 8743 | 5509 | 4031 | 2423 | 1357 | 1690 |
| 2020 | 16228 | 12809 | 8109 | 6342 | 3885 | 2716 | 1436 | 1562 |
| 2021 | 15556 | 13823 | 10139 | 6001 | 4588 | 2740 | 1777 | 1840 |
| 2022 | 15852 | 13223 | 10759 | 7270 | 4166 | 3053 | 1680 | 2102 |
| 2023 | 16629 | 13459 | 10198 | 7605 | 4945 | 2750 | 1907 | 2319 |
| 2024 | 16513 | 14139 | 10486 | 7375 | 5315 | 3385 | 1827 | 2820 |