| Year | Value | | 2022 | 5,591 | | 2021 | 5,635 | | 2020 | 5,617 | | 2019 | 5,588 | | 2018 | 5,540 | | 2017 | 5,475 | | 2016 | 5,444 | | 2015 | 5,382 | | 2014 | 5,283 | | 2013 | 5,159 | | 2012 | 4,990 | | 2011 | 4,839 | | 2010 | 4,755 | | 2009 | 4,753 | | 2008 | 4,861 | | 2007 | 5,042 | | 2006 | 5,236 | | 2005 | 5,399 | | 2004 | 5,489 | | 2003 | 5,472 | | 2002 | 5,344 | | 2001 | 5,157 | | 2000 | 4,987 | | 1999 | 4,914 | | 1998 | 4,922 | | 1997 | 4,935 | | 1996 | 4,907 | | 1995 | 4,828 | | 1994 | 4,752 | | 1993 | 4,722 | | 1992 | 4,722 | | 1991 | 4,666 | | 1990 | 4,555 | | 1989 | 4,460 | | 1988 | 4,383 | | 1987 | 4,281 | | 1986 | 4,147 | | 1985 | 4,020 | | 1984 | 3,893 | | 1983 | 3,769 | | 1982 | 3,648 | | 1981 | 3,529 | | 1980 | 3,411 | | 1979 | 3,292 | | 1978 | 3,175 | | 1977 | 3,066 | | 1976 | 2,966 | | 1975 | 2,874 | | 1974 | 2,758 | | 1973 | 2,620 | | 1972 | 2,486 | | 1971 | 2,361 | | 1970 | 2,232 | | 1969 | 2,139 | | 1968 | 2,091 | | 1967 | 2,050 | | 1966 | 2,009 | | 1965 | 1,964 | | 1964 | 1,919 | | 1963 | 1,878 | | 1962 | 1,830 | | 1961 | 1,774 | | 1960 | 1,718 |
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