| Table 3. Estimated stock numbers at age. | |||||||||
| Year Age | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| 1996 | 2015 | 2268 | 2308 | 1820 | 993 | 441 | 193 | 89 | 124 |
| 1997 | 1424 | 1684 | 1779 | 1653 | 1187 | 622 | 256 | 103 | 129 |
| 1998 | 1731 | 1219 | 1314 | 1300 | 1055 | 684 | 315 | 120 | 128 |
| 1999 | 2500 | 1511 | 1049 | 981 | 853 | 610 | 323 | 134 | 124 |
| 2000 | 2481 | 2178 | 1345 | 844 | 614 | 447 | 254 | 120 | 117 |
| 2001 | 2514 | 2116 | 1802 | 1112 | 576 | 332 | 195 | 113 | 124 |
| 2002 | 2282 | 2157 | 1812 | 1403 | 737 | 340 | 161 | 91 | 137 |
| 2003 | 2286 | 1939 | 1783 | 1411 | 901 | 430 | 195 | 89 | 147 |
| 2004 | 2462 | 1957 | 1591 | 1286 | 861 | 480 | 220 | 108 | 144 |
| 2005 | 2676 | 2025 | 1569 | 1137 | 743 | 431 | 235 | 106 | 143 |
| 2006 | 3444 | 2230 | 1575 | 1124 | 660 | 369 | 203 | 108 | 130 |
| 2007 | 3232 | 2867 | 1796 | 1146 | 665 | 322 | 171 | 81 | 112 |
| 2008 | 2858 | 2652 | 2301 | 1280 | 680 | 348 | 159 | 83 | 108 |
| 2009 | 3111 | 2410 | 2093 | 1616 | 830 | 397 | 190 | 77 | 108 |
| 2010 | 3131 | 2597 | 2033 | 1555 | 997 | 483 | 209 | 83 | 98 |
| 2011 | 2711 | 2732 | 2185 | 1559 | 991 | 541 | 230 | 87 | 89 |
| 2012 | 1936 | 2350 | 2272 | 1688 | 1022 | 575 | 264 | 96 | 85 |
| 2013 | 2134 | 1565 | 1997 | 1790 | 1072 | 553 | 249 | 94 | 82 |
| 2014 | 4175 | 1808 | 1325 | 1554 | 1345 | 645 | 296 | 118 | 94 |
| 2015 | 4157 | 3640 | 1513 | 997 | 985 | 775 | 251 | 126 | 102 |
| 2016 | 3446 | 3539 | 2882 | 1203 | 675 | 593 | 360 | 113 | 112 |
| 2017 | 3746 | 2833 | 2784 | 2109 | 849 | 414 | 333 | 199 | 133 |
| 2018 | 3223 | 3214 | 2286 | 2112 | 1428 | 540 | 248 | 207 | 216 |
| 2019 | 1453 | 2792 | 2700 | 1885 | 1388 | 987 | 347 | 165 | 280 |
| 2020 | 1116 | 1274 | 2310 | 2152 | 1338 | 818 | 533 | 198 | 245 |
| 2021 | 1003 | 927 | 1126 | 1777 | 1376 | 780 | 379 | 269 | 210 |
| 2022 | 898 | 867 | 756 | 876 | 1113 | 753 | 394 | 194 | 214 |
| 2023 | 1260 | 787 | 718 | 579 | 611 | 629 | 361 | 215 | 188 |
| 2024 | 1160 | 1107 | 643 | 530 | 366 | 373 | 311 | 201 | 198 |
| 2025 | 951 | 1029 | 954 | 493 | 342 | 220 | 190 | 155 | 170 |