| Year | Value | | 2022 | 2,185 | | 2021 | 2,069 | | 2020 | 1,953 | | 2019 | 1,836 | | 2018 | 1,731 | | 2017 | 1,638 | | 2016 | 1,560 | | 2015 | 1,491 | | 2014 | 1,429 | | 2013 | 1,372 | | 2012 | 1,319 | | 2011 | 1,272 | | 2010 | 1,228 | | 2009 | 1,177 | | 2008 | 1,122 | | 2007 | 1,075 | | 2006 | 1,027 | | 2005 | 981 | | 2004 | 941 | | 2003 | 909 | | 2002 | 860 | | 2001 | 787 | | 2000 | 715 | | 1999 | 656 | | 1998 | 619 | | 1997 | 604 | | 1996 | 606 | | 1995 | 599 | | 1994 | 583 | | 1993 | 562 | | 1992 | 540 | | 1991 | 524 | | 1990 | 519 | | 1989 | 524 | | 1988 | 527 | | 1987 | 529 | | 1986 | 533 | | 1985 | 544 | | 1984 | 562 | | 1983 | 581 | | 1982 | 595 | | 1981 | 596 | | 1980 | 577 | | 1979 | 545 | | 1978 | 512 | | 1977 | 482 | | 1976 | 456 | | 1975 | 432 | | 1974 | 407 | | 1973 | 378 | | 1972 | 348 | | 1971 | 319 | | 1970 | 290 | | 1969 | 267 | | 1968 | 248 | | 1967 | 233 | | 1966 | 220 | | 1965 | 210 | | 1964 | 199 | | 1963 | 187 | | 1962 | 175 | | 1961 | 166 | | 1960 | 157 |
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