| Year | Value | | 2022 | 3,425 | | 2021 | 3,517 | | 2020 | 3,644 | | 2019 | 3,733 | | 2018 | 3,732 | | 2017 | 3,618 | | 2016 | 3,412 | | 2015 | 3,158 | | 2014 | 2,911 | | 2013 | 2,747 | | 2012 | 2,709 | | 2011 | 2,783 | | 2010 | 2,913 | | 2009 | 3,024 | | 2008 | 3,025 | | 2007 | 2,873 | | 2006 | 2,600 | | 2005 | 2,285 | | 2004 | 2,010 | | 2003 | 1,845 | | 2002 | 1,808 | | 2001 | 1,853 | | 2000 | 1,913 | | 1999 | 1,941 | | 1998 | 1,944 | | 1997 | 1,940 | | 1996 | 1,937 | | 1995 | 1,930 | | 1994 | 1,913 | | 1993 | 1,891 | | 1992 | 1,863 | | 1991 | 1,828 | | 1990 | 1,797 | | 1989 | 1,774 | | 1988 | 1,748 | | 1987 | 1,714 | | 1986 | 1,671 | | 1985 | 1,621 | | 1984 | 1,569 | | 1983 | 1,513 | | 1982 | 1,455 | | 1981 | 1,398 | | 1980 | 1,337 | | 1979 | 1,268 | | 1978 | 1,192 | | 1977 | 1,119 | | 1976 | 1,051 | | 1975 | 990 | | 1974 | 936 | | 1973 | 887 | | 1972 | 845 | | 1971 | 808 | | 1970 | 779 | | 1969 | 754 | | 1968 | 732 | | 1967 | 713 | | 1966 | 696 | | 1965 | 679 | | 1964 | 665 | | 1963 | 653 | | 1962 | 643 | | 1961 | 637 | | 1960 | 631 |
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