| Year | Value | | 2022 | 7,648 | | 2021 | 7,386 | | 2020 | 7,258 | | 2019 | 7,208 | | 2018 | 7,206 | | 2017 | 7,220 | | 2016 | 7,175 | | 2015 | 7,104 | | 2014 | 7,018 | | 2013 | 6,899 | | 2012 | 6,788 | | 2011 | 6,649 | | 2010 | 6,444 | | 2009 | 6,247 | | 2008 | 6,103 | | 2007 | 5,936 | | 2006 | 5,722 | | 2005 | 5,539 | | 2004 | 5,379 | | 2003 | 5,198 | | 2002 | 5,035 | | 2001 | 4,842 | | 2000 | 4,663 | | 1999 | 4,597 | | 1998 | 4,548 | | 1997 | 4,455 | | 1996 | 4,375 | | 1995 | 4,317 | | 1994 | 4,230 | | 1993 | 4,135 | | 1992 | 4,064 | | 1991 | 3,978 | | 1990 | 3,895 | | 1989 | 3,832 | | 1988 | 3,774 | | 1987 | 3,697 | | 1986 | 3,609 | | 1985 | 3,542 | | 1984 | 3,450 | | 1983 | 3,332 | | 1982 | 3,238 | | 1981 | 3,172 | | 1980 | 3,072 | | 1979 | 2,927 | | 1978 | 2,794 | | 1977 | 2,668 | | 1976 | 2,534 | | 1975 | 2,375 | | 1974 | 2,243 | | 1973 | 2,127 | | 1972 | 1,995 | | 1971 | 1,857 | | 1970 | 1,755 | | 1969 | 1,702 | | 1968 | 1,668 | | 1967 | 1,641 | | 1966 | 1,599 | | 1965 | 1,558 | | 1964 | 1,529 | | 1963 | 1,513 | | 1962 | 1,513 | | 1961 | 1,522 | | 1960 | 1,528 |
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