| Year | Value | | 2022 | 5,054 | | 2021 | 4,815 | | 2020 | 4,564 | | 2019 | 4,329 | | 2018 | 4,173 | | 2017 | 4,101 | | 2016 | 4,081 | | 2015 | 4,084 | | 2014 | 4,097 | | 2013 | 4,093 | | 2012 | 4,050 | | 2011 | 3,992 | | 2010 | 3,956 | | 2009 | 3,950 | | 2008 | 3,990 | | 2007 | 4,074 | | 2006 | 4,161 | | 2005 | 4,223 | | 2004 | 4,255 | | 2003 | 4,084 | | 2002 | 3,727 | | 2001 | 3,384 | | 2000 | 3,077 | | 1999 | 2,816 | | 1998 | 2,599 | | 1997 | 2,408 | | 1996 | 2,233 | | 1995 | 2,064 | | 1994 | 1,932 | | 1993 | 1,846 | | 1992 | 1,766 | | 1991 | 1,695 | | 1990 | 1,650 | | 1989 | 1,634 | | 1988 | 1,644 | | 1987 | 1,686 | | 1986 | 1,747 | | 1985 | 1,808 | | 1984 | 1,863 | | 1983 | 1,912 | | 1982 | 1,956 | | 1981 | 1,995 | | 1980 | 2,038 | | 1979 | 2,060 | | 1978 | 2,051 | | 1977 | 2,034 | | 1976 | 2,024 | | 1975 | 2,037 | | 1974 | 2,080 | | 1973 | 2,145 | | 1972 | 2,228 | | 1971 | 2,293 | | 1970 | 2,337 | | 1969 | 2,386 | | 1968 | 2,426 | | 1967 | 2,447 | | 1966 | 2,446 | | 1965 | 2,426 | | 1964 | 2,352 | | 1963 | 2,109 | | 1962 | 1,766 | | 1961 | 1,557 | | 1960 | 1,467 |
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