| Year | Value | | 2022 | 4,222 | | 2021 | 4,066 | | 2020 | 3,929 | | 2019 | 3,819 | | 2018 | 3,733 | | 2017 | 3,658 | | 2016 | 3,591 | | 2015 | 3,531 | | 2014 | 3,475 | | 2013 | 3,412 | | 2012 | 3,347 | | 2011 | 3,278 | | 2010 | 3,202 | | 2009 | 3,107 | | 2008 | 3,004 | | 2007 | 2,891 | | 2006 | 2,758 | | 2005 | 2,620 | | 2004 | 2,487 | | 2003 | 2,350 | | 2002 | 2,226 | | 2001 | 2,133 | | 2000 | 2,059 | | 1999 | 1,997 | | 1998 | 1,938 | | 1997 | 1,877 | | 1996 | 1,814 | | 1995 | 1,750 | | 1994 | 1,694 | | 1993 | 1,650 | | 1992 | 1,618 | | 1991 | 1,602 | | 1990 | 1,601 | | 1989 | 1,602 | | 1988 | 1,596 | | 1987 | 1,594 | | 1986 | 1,591 | | 1985 | 1,584 | | 1984 | 1,570 | | 1983 | 1,553 | | 1982 | 1,532 | | 1981 | 1,512 | | 1980 | 1,489 | | 1979 | 1,445 | | 1978 | 1,389 | | 1977 | 1,340 | | 1976 | 1,292 | | 1975 | 1,244 | | 1974 | 1,196 | | 1973 | 1,149 | | 1972 | 1,103 | | 1971 | 1,058 | | 1970 | 1,014 | | 1969 | 975 | | 1968 | 941 | | 1967 | 911 | | 1966 | 888 | | 1965 | 873 | | 1964 | 863 | | 1963 | 860 | | 1962 | 860 | | 1961 | 857 | | 1960 | 847 |
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