| Year | Value | | 2022 | 6,202 | | 2021 | 6,286 | | 2020 | 6,193 | | 2019 | 5,945 | | 2018 | 5,679 | | 2017 | 5,434 | | 2016 | 5,215 | | 2015 | 5,026 | | 2014 | 4,860 | | 2013 | 4,712 | | 2012 | 4,583 | | 2011 | 4,468 | | 2010 | 4,362 | | 2009 | 4,274 | | 2008 | 4,216 | | 2007 | 4,180 | | 2006 | 4,151 | | 2005 | 4,118 | | 2004 | 4,082 | | 2003 | 4,022 | | 2002 | 3,939 | | 2001 | 3,856 | | 2000 | 3,777 | | 1999 | 3,693 | | 1998 | 3,622 | | 1997 | 3,569 | | 1996 | 3,515 | | 1995 | 3,461 | | 1994 | 3,414 | | 1993 | 3,371 | | 1992 | 3,333 | | 1991 | 3,300 | | 1990 | 3,258 | | 1989 | 3,209 | | 1988 | 3,160 | | 1987 | 3,112 | | 1986 | 3,065 | | 1985 | 3,027 | | 1984 | 2,998 | | 1983 | 2,981 | | 1982 | 2,969 | | 1981 | 2,956 | | 1980 | 2,933 | | 1979 | 2,894 | | 1978 | 2,839 | | 1977 | 2,775 | | 1976 | 2,702 | | 1975 | 2,621 | | 1974 | 2,529 | | 1973 | 2,425 | | 1972 | 2,317 | | 1971 | 2,222 | | 1970 | 2,154 | | 1969 | 2,118 | | 1968 | 2,120 | | 1967 | 2,150 | | 1966 | 2,177 | | 1965 | 2,177 | | 1964 | 2,152 | | 1963 | 2,095 | | 1962 | 2,013 | | 1961 | 1,940 | | 1960 | 1,898 |
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