| Year | Value | | 2022 | 1,638 | | 2021 | 1,578 | | 2020 | 1,532 | | 2019 | 1,472 | | 2018 | 1,409 | | 2017 | 1,344 | | 2016 | 1,256 | | 2015 | 1,167 | | 2014 | 1,101 | | 2013 | 1,051 | | 2012 | 1,003 | | 2011 | 944 | | 2010 | 889 | | 2009 | 843 | | 2008 | 804 | | 2007 | 777 | | 2006 | 764 | | 2005 | 754 | | 2004 | 748 | | 2003 | 745 | | 2002 | 736 | | 2001 | 719 | | 2000 | 709 | | 1999 | 705 | | 1998 | 704 | | 1997 | 706 | | 1996 | 711 | | 1995 | 717 | | 1994 | 717 | | 1993 | 718 | | 1992 | 729 | | 1991 | 745 | | 1990 | 787 | | 1989 | 849 | | 1988 | 896 | | 1987 | 932 | | 1986 | 959 | | 1985 | 981 | | 1984 | 1,002 | | 1983 | 1,009 | | 1982 | 1,003 | | 1981 | 994 | | 1980 | 977 | | 1979 | 955 | | 1978 | 925 | | 1977 | 885 | | 1976 | 837 | | 1975 | 784 | | 1974 | 725 | | 1973 | 661 | | 1972 | 597 | | 1971 | 538 | | 1970 | 487 | | 1969 | 475 | | 1968 | 498 | | 1967 | 515 | | 1966 | 519 | | 1965 | 510 | | 1964 | 482 | | 1963 | 435 | | 1962 | 381 | | 1961 | 331 | | 1960 | 291 |
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