| Table 2. Estimated stock numbers. | |||||||
| Year\Age | 1 | 2 | 3 | 4 | 5 | 6 | 7+ | 
| 1963 | 456800 | 184795 | 21705 | 10331 | 8448 | 3223 | 1598 | 
| 1964 | 843234 | 140505 | 52575 | 11645 | 5281 | 4515 | 2253 | 
| 1965 | 1039240 | 251450 | 40741 | 22834 | 6299 | 2586 | 3079 | 
| 1966 | 1362729 | 286932 | 69633 | 16606 | 9803 | 3274 | 2858 | 
| 1967 | 1245441 | 364762 | 73277 | 29028 | 7819 | 4722 | 3185 | 
| 1968 | 654744 | 323515 | 91400 | 27861 | 14059 | 3438 | 3493 | 
| 1969 | 586542 | 160974 | 77111 | 33996 | 11259 | 6513 | 3052 | 
| 1970 | 1765598 | 147119 | 40215 | 32338 | 15334 | 4759 | 4021 | 
| 1971 | 2350174 | 435827 | 35172 | 15015 | 15503 | 6864 | 4171 | 
| 1972 | 580126 | 555154 | 92874 | 12260 | 6132 | 6719 | 5420 | 
| 1973 | 842391 | 126627 | 110304 | 29261 | 4976 | 2528 | 4595 | 
| 1974 | 733806 | 183689 | 24760 | 36791 | 11078 | 2158 | 3171 | 
| 1975 | 1244196 | 171099 | 38139 | 9642 | 16252 | 4636 | 2289 | 
| 1976 | 785441 | 282377 | 34718 | 13668 | 3990 | 6842 | 2812 | 
| 1977 | 1990706 | 164391 | 53157 | 11281 | 5338 | 1749 | 4070 | 
| 1978 | 1292385 | 425917 | 31477 | 18693 | 5201 | 2285 | 2312 | 
| 1979 | 1465929 | 267801 | 80741 | 9370 | 7203 | 1837 | 1814 | 
| 1980 | 2361954 | 296855 | 58983 | 25109 | 4041 | 2873 | 1712 | 
| 1981 | 951695 | 463240 | 58865 | 17822 | 9200 | 1656 | 1867 | 
| 1982 | 1519664 | 181498 | 90129 | 16955 | 6685 | 3796 | 1467 | 
| 1983 | 873270 | 281813 | 32403 | 21316 | 5455 | 2445 | 1855 | 
| 1984 | 1468864 | 167711 | 51844 | 8147 | 6865 | 2031 | 1610 | 
| 1985 | 405550 | 292728 | 33456 | 15404 | 2904 | 2654 | 1399 | 
| 1986 | 1723728 | 84373 | 57526 | 10300 | 5646 | 1163 | 1643 | 
| 1987 | 691764 | 365127 | 16968 | 15592 | 3236 | 2013 | 1042 | 
| 1988 | 482145 | 151903 | 69079 | 5307 | 5068 | 1247 | 998 | 
| 1989 | 764517 | 106511 | 30061 | 17380 | 1817 | 1902 | 842 | 
| 1990 | 338744 | 169736 | 20068 | 7846 | 5091 | 643 | 954 | 
| 1991 | 361494 | 78669 | 30915 | 5938 | 2620 | 1923 | 681 | 
| 1992 | 733073 | 87204 | 15435 | 8671 | 1975 | 930 | 876 | 
| 1993 | 417901 | 184241 | 17962 | 4998 | 2812 | 741 | 632 | 
| 1994 | 847461 | 105030 | 35775 | 5367 | 1705 | 1001 | 490 | 
| 1995 | 516588 | 217075 | 22292 | 10152 | 1749 | 638 | 524 | 
| 1996 | 378511 | 131400 | 38716 | 5678 | 3172 | 652 | 470 | 
| 1997 | 959339 | 99808 | 25900 | 9584 | 1884 | 1046 | 370 | 
| 1998 | 169736 | 257043 | 20597 | 6966 | 2852 | 656 | 437 | 
| 1999 | 294785 | 43871 | 48339 | 5201 | 1978 | 836 | 398 | 
| 2000 | 523347 | 79221 | 9279 | 10453 | 1451 | 602 | 346 | 
| 2001 | 217510 | 146239 | 15923 | 2395 | 2475 | 364 | 293 | 
| 2002 | 265667 | 60355 | 29407 | 4326 | 656 | 662 | 196 | 
| 2003 | 151903 | 72186 | 12132 | 7993 | 1176 | 189 | 242 | 
| 2004 | 221461 | 42235 | 14062 | 3231 | 2060 | 329 | 121 | 
| 2005 | 171099 | 58396 | 8107 | 3389 | 963 | 624 | 135 | 
| 2006 | 350459 | 46490 | 11415 | 2119 | 959 | 303 | 240 | 
| 2007 | 165877 | 97929 | 9203 | 3599 | 843 | 311 | 168 | 
| 2008 | 187587 | 45388 | 21280 | 2927 | 1331 | 352 | 182 | 
| 2009 | 203211 | 50970 | 10248 | 6961 | 1138 | 443 | 175 | 
| 2010 | 285501 | 55050 | 11216 | 3448 | 2526 | 367 | 179 | 
| 2011 | 168215 | 76267 | 12549 | 3689 | 1350 | 886 | 177 | 
| 2012 | 260928 | 44712 | 19155 | 5470 | 1524 | 543 | 373 | 
| 2013 | 276509 | 66237 | 11600 | 8765 | 2625 | 623 | 374 | 
| 2014 | 334369 | 69010 | 17276 | 5608 | 4409 | 1260 | 457 |