| Year | Value | | 2022 | 6,038 | | 2021 | 6,004 | | 2020 | 5,886 | | 2019 | 5,686 | | 2018 | 5,368 | | 2017 | 5,010 | | 2016 | 4,765 | | 2015 | 4,587 | | 2014 | 4,483 | | 2013 | 4,439 | | 2012 | 4,411 | | 2011 | 4,373 | | 2010 | 4,313 | | 2009 | 4,219 | | 2008 | 4,100 | | 2007 | 3,974 | | 2006 | 3,857 | | 2005 | 3,772 | | 2004 | 3,721 | | 2003 | 3,703 | | 2002 | 3,723 | | 2001 | 3,778 | | 2000 | 3,846 | | 1999 | 3,918 | | 1998 | 3,982 | | 1997 | 4,034 | | 1996 | 4,057 | | 1995 | 4,034 | | 1994 | 3,971 | | 1993 | 3,885 | | 1992 | 3,800 | | 1991 | 3,737 | | 1990 | 3,715 | | 1989 | 3,732 | | 1988 | 3,785 | | 1987 | 3,867 | | 1986 | 3,959 | | 1985 | 4,033 | | 1984 | 4,056 | | 1983 | 4,017 | | 1982 | 3,931 | | 1981 | 3,823 | | 1980 | 3,727 | | 1979 | 3,671 | | 1978 | 3,653 | | 1977 | 3,656 | | 1976 | 3,661 | | 1975 | 3,647 | | 1974 | 3,599 | | 1973 | 3,514 | | 1972 | 3,399 | | 1971 | 3,264 | | 1970 | 3,122 | | 1969 | 2,985 | | 1968 | 2,858 | | 1967 | 2,741 | | 1966 | 2,629 | | 1965 | 2,526 | | 1964 | 2,427 | | 1963 | 2,336 | | 1962 | 2,256 | | 1961 | 2,189 | | 1960 | 2,126 |
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