| Year | Value | | 2022 | 11,357 | | 2021 | 11,093 | | 2020 | 10,959 | | 2019 | 10,993 | | 2018 | 10,926 | | 2017 | 10,753 | | 2016 | 10,613 | | 2015 | 10,444 | | 2014 | 10,188 | | 2013 | 9,983 | | 2012 | 9,782 | | 2011 | 9,478 | | 2010 | 9,277 | | 2009 | 9,209 | | 2008 | 9,067 | | 2007 | 8,853 | | 2006 | 8,573 | | 2005 | 8,173 | | 2004 | 7,759 | | 2003 | 7,415 | | 2002 | 7,080 | | 2001 | 6,676 | | 2000 | 6,199 | | 1999 | 5,775 | | 1998 | 5,456 | | 1997 | 5,194 | | 1996 | 5,024 | | 1995 | 4,975 | | 1994 | 4,979 | | 1993 | 4,982 | | 1992 | 5,000 | | 1991 | 5,099 | | 1990 | 5,274 | | 1989 | 5,389 | | 1988 | 5,441 | | 1987 | 5,459 | | 1986 | 5,383 | | 1985 | 5,258 | | 1984 | 5,145 | | 1983 | 5,067 | | 1982 | 4,985 | | 1981 | 4,937 | | 1980 | 4,914 | | 1979 | 4,828 | | 1978 | 4,712 | | 1977 | 4,621 | | 1976 | 4,501 | | 1975 | 4,353 | | 1974 | 4,282 | | 1973 | 4,237 | | 1972 | 4,172 | | 1971 | 4,103 | | 1970 | 4,045 | | 1969 | 4,028 | | 1968 | 3,987 | | 1967 | 3,891 | | 1966 | 3,841 | | 1965 | 3,823 | | 1964 | 3,789 | | 1963 | 3,794 | | 1962 | 3,798 | | 1961 | 3,713 | | 1960 | 3,589 |
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