| Table 3. Estimated stock numbers at age. | |||||||||
| Year Age | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| 1978 | 28093131 | 7448897 | 1651836 | 767433 | 227460 | 19138 | 12917 | 3024 | 717 |
| 1979 | 19906914 | 8265277 | 1988816 | 557991 | 248129 | 64875 | 5514 | 3115 | 991 |
| 1980 | 9748594 | 6019803 | 2260732 | 691609 | 172210 | 73658 | 16319 | 1418 | 1220 |
| 1981 | 8621203 | 2550646 | 1789726 | 788646 | 218252 | 50047 | 17164 | 4475 | 752 |
| 1982 | 6426583 | 2202971 | 614359 | 671747 | 234908 | 59363 | 11639 | 4012 | 1449 |
| 1983 | 9051118 | 1644900 | 505893 | 221204 | 216943 | 67151 | 13466 | 2619 | 1701 |
| 1984 | 8588217 | 2596512 | 410517 | 182476 | 68536 | 66071 | 16068 | 3386 | 1257 |
| 1985 | 15695829 | 2333166 | 718395 | 158350 | 57993 | 19354 | 17215 | 3721 | 1348 |
| 1986 | 15398613 | 4856183 | 634194 | 286100 | 53571 | 16820 | 4319 | 4331 | 1197 |
| 1987 | 14090829 | 4634069 | 1415476 | 243603 | 102939 | 13929 | 4191 | 1007 | 1388 |
| 1988 | 18788834 | 4072947 | 1481331 | 533248 | 85061 | 31262 | 3358 | 1006 | 693 |
| 1989 | 11098440 | 5952548 | 1058383 | 603854 | 179964 | 24312 | 7891 | 851 | 713 |
| 1990 | 10036979 | 3087767 | 1820196 | 403328 | 219692 | 56714 | 5464 | 2180 | 593 |
| 1991 | 12200237 | 2738416 | 847313 | 742725 | 130815 | 69039 | 15363 | 1543 | 982 |
| 1992 | 14094003 | 3337122 | 852141 | 314754 | 287200 | 36823 | 16899 | 5336 | 654 |
| 1993 | 14515869 | 3827895 | 884939 | 347508 | 118917 | 95831 | 9803 | 4727 | 2596 |
| 1994 | 12574144 | 3860538 | 1064959 | 335873 | 118259 | 39417 | 27782 | 2819 | 2120 |
| 1995 | 9750367 | 3157082 | 1083212 | 426333 | 117875 | 37639 | 11404 | 8814 | 1741 |
| 1996 | 7549884 | 2194207 | 881579 | 434462 | 159960 | 39351 | 11901 | 3651 | 4722 |
| 1997 | 10853424 | 1642538 | 560637 | 365940 | 155376 | 57027 | 12193 | 3940 | 3237 |
| 1998 | 17861968 | 2339299 | 419222 | 230369 | 142414 | 54864 | 18603 | 4386 | 2688 |
| 1999 | 19021625 | 3795776 | 613234 | 167190 | 97746 | 52216 | 19436 | 6202 | 2835 |
| 2000 | 13932602 | 3739539 | 1038515 | 253377 | 69976 | 36152 | 18056 | 7392 | 3471 |
| 2001 | 12050888 | 2536132 | 1107256 | 430867 | 106163 | 26884 | 14394 | 6836 | 5528 |
| 2002 | 7224242 | 2048544 | 724085 | 550565 | 187080 | 41853 | 9292 | 5637 | 4662 |
| 2003 | 6516338 | 1081929 | 521736 | 344089 | 254457 | 77665 | 15882 | 3462 | 4269 |
| 2004 | 6677595 | 987412 | 234404 | 229619 | 169205 | 107870 | 32777 | 6324 | 2732 |
| 2005 | 6503169 | 1004302 | 245895 | 91806 | 106223 | 77074 | 43643 | 13287 | 3993 |
| 2006 | 5022694 | 992650 | 273039 | 98492 | 41759 | 51520 | 34475 | 17268 | 7322 |
| 2007 | 6765765 | 725541 | 258771 | 122266 | 41431 | 18641 | 24027 | 14361 | 11606 |
| 2008 | 6674321 | 1060608 | 185056 | 112897 | 53616 | 17194 | 8075 | 10793 | 14881 |
| 2009 | 6453785 | 1116826 | 277440 | 75303 | 46242 | 23977 | 7391 | 3505 | 11701 |
| 2010 | 6648899 | 1094418 | 335364 | 112286 | 34508 | 20823 | 10405 | 3013 | 7153 |
| 2011 | 5159465 | 1105858 | 345154 | 151287 | 54021 | 16265 | 9107 | 4261 | 4753 |
| 2012 | 4456769 | 772164 | 352883 | 149025 | 72620 | 24820 | 7111 | 3676 | 4690 |
| 2013 | 7688453 | 610979 | 201368 | 172479 | 71622 | 30112 | 9979 | 2854 | 3735 |
| 2014 | 9050774 | 1155175 | 185501 | 94419 | 82691 | 30950 | 11523 | 4195 | 3090 |
| 2015 | 8762135 | 1310051 | 368982 | 78543 | 46075 | 36851 | 11763 | 4665 | 3472 |
| 2016 | 10279211 | 1283266 | 387168 | 153454 | 36618 | 19768 | 13493 | 5001 | 3440 |
| 2017 | 6642241 | 1627491 | 390728 | 155538 | 62338 | 15404 | 7055 | 5667 | 3798 |
| 2018 | 9181370 | 989097 | 477177 | 164213 | 65821 | 23938 | 5533 | 3036 | 3425 |
| 2019 | 16330576 | 1590655 | 301164 | 206678 | 73699 | 25939 | 7999 | 2360 | 2076 |
| 2020 | 15523436 | 3323256 | 447845 | 145492 | 95987 | 29993 | 9935 | 3122 | 1422 |
| 2021 | 8283138 | 3128619 | 1123531 | 198530 | 74121 | 40551 | 12035 | 4140 | 1246 |
| 2022 | 9724251 | 1459034 | 1078274 | 565184 | 98168 | 32986 | 16527 | 4917 | 2316 |
| 2023 | 6861726 | 1890116 | 486499 | 535426 | 298092 | 42191 | 13159 | 7234 | 2998 |
| 2024 | 11794004 | 1207914 | 559513 | 236139 | 307258 | 145766 | 17064 | 5464 | 5048 |
| 2025 | 11794004 | 2282105 | 375098 | 267003 | 121941 | 145556 | 63086 | 7652 | 5139 |