| Year | Value | | 2022 | 3,169 | | 2021 | 3,244 | | 2020 | 3,334 | | 2019 | 3,426 | | 2018 | 3,503 | | 2017 | 3,583 | | 2016 | 3,657 | | 2015 | 3,716 | | 2014 | 3,752 | | 2013 | 3,770 | | 2012 | 3,777 | | 2011 | 3,774 | | 2010 | 3,771 | | 2009 | 3,805 | | 2008 | 3,855 | | 2007 | 3,874 | | 2006 | 3,867 | | 2005 | 3,828 | | 2004 | 3,742 | | 2003 | 3,632 | | 2002 | 3,536 | | 2001 | 3,475 | | 2000 | 3,451 | | 1999 | 3,501 | | 1998 | 3,631 | | 1997 | 3,784 | | 1996 | 3,959 | | 1995 | 4,108 | | 1994 | 4,156 | | 1993 | 4,144 | | 1992 | 4,068 | | 1991 | 3,863 | | 1990 | 3,622 | | 1989 | 3,327 | | 1988 | 3,091 | | 1987 | 2,873 | | 1986 | 2,715 | | 1985 | 2,569 | | 1984 | 2,416 | | 1983 | 2,299 | | 1982 | 2,207 | | 1981 | 2,111 | | 1980 | 2,052 | | 1979 | 1,978 | | 1978 | 1,978 | | 1977 | 1,914 | | 1976 | 1,978 | | 1975 | 1,958 | | 1974 | 1,876 | | 1973 | 1,774 | | 1972 | 1,636 | | 1971 | 1,552 | | 1970 | 1,417 | | 1969 | 1,373 | | 1968 | 1,304 | | 1967 | 1,201 | | 1966 | 1,199 | | 1965 | 1,208 | | 1964 | 1,190 | | 1963 | 1,190 | | 1962 | 1,066 | | 1961 | 1,052 | | 1960 | 898 |
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