| Table 2b. Upper bound of estimated stock numbers. | ||||||||
| Year\Age | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7+ |
| 1970 | 708241 | 362029 | 144732 | 27607 | 10958 | 3760 | 1326 | 980 |
| 1971 | 777019 | 287570 | 153934 | 41213 | 7943 | 3943 | 1632 | 999 |
| 1972 | 442953 | 340646 | 121691 | 43245 | 11790 | 2832 | 1586 | 1017 |
| 1973 | 708695 | 169238 | 155189 | 38096 | 11935 | 3769 | 954 | 941 |
| 1974 | 468092 | 314261 | 73403 | 48758 | 11211 | 3749 | 1579 | 776 |
| 1975 | 443539 | 189454 | 153405 | 22657 | 12647 | 3067 | 1330 | 912 |
| 1976 | 607763 | 179218 | 95380 | 54018 | 6588 | 3771 | 1177 | 828 |
| 1977 | 459181 | 263651 | 86103 | 29257 | 12681 | 2139 | 1275 | 774 |
| 1978 | 266567 | 194845 | 142686 | 26483 | 7340 | 3482 | 853 | 790 |
| 1979 | 505013 | 101568 | 104281 | 49152 | 7843 | 2587 | 1505 | 762 |
| 1980 | 420080 | 222905 | 48933 | 43041 | 14667 | 3033 | 1172 | 1106 |
| 1981 | 450503 | 171888 | 124110 | 23043 | 12249 | 5184 | 1369 | 968 |
| 1982 | 455085 | 188716 | 92880 | 43441 | 6459 | 3523 | 1763 | 938 |
| 1983 | 200924 | 202618 | 93300 | 34761 | 12624 | 2686 | 1381 | 1033 |
| 1984 | 163110 | 79434 | 108203 | 30188 | 10922 | 4366 | 1172 | 953 |
| 1985 | 301691 | 63631 | 38543 | 36342 | 9899 | 4053 | 1787 | 842 |
| 1986 | 203549 | 134821 | 32373 | 16835 | 9310 | 3008 | 1437 | 860 |
| 1987 | 89780 | 87832 | 84870 | 15194 | 4602 | 2346 | 865 | 742 |
| 1988 | 112299 | 34472 | 51854 | 34322 | 5420 | 1507 | 844 | 637 |
| 1989 | 115856 | 47563 | 18751 | 21671 | 10113 | 1901 | 619 | 570 |
| 1990 | 171665 | 46799 | 28969 | 10407 | 6487 | 3000 | 644 | 431 |
| 1991 | 322739 | 69954 | 27372 | 13093 | 4488 | 1937 | 784 | 251 |
| 1992 | 194853 | 141977 | 42136 | 14028 | 4102 | 1718 | 472 | 258 |
| 1993 | 243594 | 76802 | 89070 | 22419 | 4776 | 1707 | 542 | 173 |
| 1994 | 357603 | 99963 | 53512 | 48569 | 8993 | 1871 | 467 | 204 |
| 1995 | 94792 | 159181 | 72619 | 26992 | 19696 | 4316 | 725 | 213 |
| 1996 | 313809 | 34279 | 108808 | 40079 | 10491 | 7303 | 1435 | 237 |
| 1997 | 471701 | 136475 | 19505 | 52820 | 10849 | 3942 | 2064 | 536 |
| 1998 | 211242 | 199446 | 83345 | 10859 | 13114 | 3047 | 1286 | 617 |
| 1999 | 225817 | 81077 | 110512 | 35285 | 4722 | 4048 | 1093 | 501 |
| 2000 | 199111 | 92713 | 53968 | 46754 | 10684 | 1793 | 1157 | 424 |
| 2001 | 248615 | 82438 | 57248 | 24139 | 12703 | 3552 | 571 | 392 |
| 2002 | 113081 | 107173 | 43755 | 22950 | 6579 | 3437 | 1063 | 304 |
| 2003 | 313759 | 39248 | 69186 | 19729 | 6697 | 2134 | 940 | 392 |
| 2004 | 213938 | 138391 | 24047 | 31832 | 7793 | 2476 | 736 | 377 |
| 2005 | 155540 | 88036 | 98712 | 13034 | 10714 | 3003 | 785 | 273 |
| 2006 | 140152 | 63373 | 54375 | 53811 | 5558 | 3382 | 802 | 355 |
| 2007 | 111781 | 57254 | 47716 | 30800 | 21891 | 3168 | 1251 | 387 |
| 2008 | 201217 | 43511 | 41201 | 31850 | 13365 | 7688 | 1377 | 604 |
| 2009 | 138195 | 85794 | 33390 | 27214 | 17364 | 5408 | 2046 | 616 |
| 2010 | 158239 | 55055 | 69344 | 25666 | 14792 | 5916 | 1856 | 818 |
| 2011 | 137470 | 64749 | 40897 | 43455 | 16148 | 6470 | 1577 | 785 |
| 2012 | 327374 | 56124 | 49383 | 31530 | 28096 | 7759 | 2256 | 573 |
| 2013 | 596110 | 155124 | 46050 | 40866 | 21673 | 15274 | 3490 | 1431 |