| Year | Value | | 2022 | 2,468 | | 2021 | 2,427 | | 2020 | 2,390 | | 2019 | 2,342 | | 2018 | 2,289 | | 2017 | 2,229 | | 2016 | 2,165 | | 2015 | 2,096 | | 2014 | 2,028 | | 2013 | 1,967 | | 2012 | 1,919 | | 2011 | 1,884 | | 2010 | 1,865 | | 2009 | 1,861 | | 2008 | 1,875 | | 2007 | 1,905 | | 2006 | 1,945 | | 2005 | 1,987 | | 2004 | 2,015 | | 2003 | 2,019 | | 2002 | 2,001 | | 2001 | 1,961 | | 2000 | 1,903 | | 1999 | 1,839 | | 1998 | 1,776 | | 1997 | 1,707 | | 1996 | 1,633 | | 1995 | 1,560 | | 1994 | 1,491 | | 1993 | 1,431 | | 1992 | 1,378 | | 1991 | 1,335 | | 1990 | 1,298 | | 1989 | 1,258 | | 1988 | 1,218 | | 1987 | 1,177 | | 1986 | 1,135 | | 1985 | 1,095 | | 1984 | 1,058 | | 1983 | 1,027 | | 1982 | 1,003 | | 1981 | 983 | | 1980 | 969 | | 1979 | 959 | | 1978 | 948 | | 1977 | 933 | | 1976 | 916 | | 1975 | 899 | | 1974 | 883 | | 1973 | 868 | | 1972 | 854 | | 1971 | 842 | | 1970 | 830 | | 1969 | 816 | | 1968 | 805 | | 1967 | 793 | | 1966 | 780 | | 1965 | 767 | | 1964 | 754 | | 1963 | 742 | | 1962 | 730 | | 1961 | 718 | | 1960 | 704 |
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