| Year | Value | | 2022 | 2,078 | | 2021 | 1,993 | | 2020 | 1,918 | | 2019 | 1,830 | | 2018 | 1,742 | | 2017 | 1,657 | | 2016 | 1,565 | | 2015 | 1,485 | | 2014 | 1,414 | | 2013 | 1,339 | | 2012 | 1,267 | | 2011 | 1,198 | | 2010 | 1,125 | | 2009 | 1,065 | | 2008 | 1,023 | | 2007 | 982 | | 2006 | 948 | | 2005 | 928 | | 2004 | 916 | | 2003 | 903 | | 2002 | 888 | | 2001 | 865 | | 2000 | 847 | | 1999 | 844 | | 1998 | 852 | | 1997 | 868 | | 1996 | 877 | | 1995 | 881 | | 1994 | 890 | | 1993 | 898 | | 1992 | 902 | | 1991 | 895 | | 1990 | 900 | | 1989 | 926 | | 1988 | 961 | | 1987 | 999 | | 1986 | 1,038 | | 1985 | 1,071 | | 1984 | 1,093 | | 1983 | 1,092 | | 1982 | 1,072 | | 1981 | 1,051 | | 1980 | 1,030 | | 1979 | 1,014 | | 1978 | 1,001 | | 1977 | 989 | | 1976 | 976 | | 1975 | 961 | | 1974 | 937 | | 1973 | 909 | | 1972 | 879 | | 1971 | 846 | | 1970 | 814 | | 1969 | 795 | | 1968 | 793 | | 1967 | 796 | | 1966 | 799 | | 1965 | 790 | | 1964 | 761 | | 1963 | 706 | | 1962 | 633 | | 1961 | 570 | | 1960 | 534 |
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