| Year | Value | | 2022 | 10,536 | | 2021 | 9,362 | | 2020 | 8,504 | | 2019 | 7,565 | | 2018 | 6,599 | | 2017 | 6,160 | | 2016 | 6,252 | | 2015 | 6,417 | | 2014 | 6,420 | | 2013 | 6,266 | | 2012 | 6,057 | | 2011 | 5,857 | | 2010 | 5,593 | | 2009 | 5,311 | | 2008 | 5,091 | | 2007 | 4,889 | | 2006 | 4,727 | | 2005 | 4,625 | | 2004 | 4,564 | | 2003 | 4,542 | | 2002 | 4,525 | | 2001 | 4,475 | | 2000 | 4,425 | | 1999 | 4,355 | | 1998 | 4,225 | | 1997 | 4,067 | | 1996 | 3,887 | | 1995 | 3,653 | | 1994 | 3,389 | | 1993 | 3,190 | | 1992 | 3,087 | | 1991 | 3,054 | | 1990 | 3,004 | | 1989 | 3,012 | | 1988 | 3,024 | | 1987 | 3,036 | | 1986 | 3,039 | | 1985 | 3,006 | | 1984 | 2,939 | | 1983 | 2,869 | | 1982 | 2,743 | | 1981 | 2,577 | | 1980 | 2,434 | | 1979 | 2,299 | | 1978 | 2,175 | | 1977 | 2,062 | | 1976 | 1,977 | | 1975 | 1,908 | | 1974 | 1,853 | | 1973 | 1,835 | | 1972 | 1,841 | | 1971 | 1,863 | | 1970 | 1,884 | | 1969 | 1,907 | | 1968 | 1,921 | | 1967 | 1,907 | | 1966 | 1,883 | | 1965 | 1,864 | | 1964 | 1,837 | | 1963 | 1,810 | | 1962 | 1,796 | | 1961 | 1,779 | | 1960 | 1,758 |
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