| Year | Value | | 2022 | 9,730 | | 2021 | 9,596 | | 2020 | 9,389 | | 2019 | 9,173 | | 2018 | 8,955 | | 2017 | 8,750 | | 2016 | 8,525 | | 2015 | 8,362 | | 2014 | 8,279 | | 2013 | 8,181 | | 2012 | 8,073 | | 2011 | 7,956 | | 2010 | 7,997 | | 2009 | 8,189 | | 2008 | 8,363 | | 2007 | 8,358 | | 2006 | 8,177 | | 2005 | 7,755 | | 2004 | 7,116 | | 2003 | 6,499 | | 2002 | 5,922 | | 2001 | 5,388 | | 2000 | 5,027 | | 1999 | 4,815 | | 1998 | 4,611 | | 1997 | 4,411 | | 1996 | 4,218 | | 1995 | 3,989 | | 1994 | 3,729 | | 1993 | 3,484 | | 1992 | 3,251 | | 1991 | 3,032 | | 1990 | 2,833 | | 1989 | 2,648 | | 1988 | 2,469 | | 1987 | 2,297 | | 1986 | 2,132 | | 1985 | 2,121 | | 1984 | 2,257 | | 1983 | 2,390 | | 1982 | 2,519 | | 1981 | 2,663 | | 1980 | 2,826 | | 1979 | 2,985 | | 1978 | 3,134 | | 1977 | 3,274 | | 1976 | 3,403 | | 1975 | 3,524 | | 1974 | 3,632 | | 1973 | 3,728 | | 1972 | 3,813 | | 1971 | 3,885 | | 1970 | 3,941 | | 1969 | 3,981 | | 1968 | 3,999 | | 1967 | 3,993 | | 1966 | 3,987 | | 1965 | 4,009 | | 1964 | 4,035 | | 1963 | 4,040 | | 1962 | 4,024 | | 1961 | 3,986 | | 1960 | 3,924 |
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