| Year | Value | | 2022 | 6,191 | | 2021 | 6,179 | | 2020 | 6,152 | | 2019 | 6,090 | | 2018 | 5,997 | | 2017 | 5,882 | | 2016 | 5,736 | | 2015 | 5,555 | | 2014 | 5,360 | | 2013 | 5,162 | | 2012 | 4,959 | | 2011 | 4,746 | | 2010 | 4,524 | | 2009 | 4,284 | | 2008 | 4,030 | | 2007 | 3,793 | | 2006 | 3,585 | | 2005 | 3,405 | | 2004 | 3,262 | | 2003 | 3,155 | | 2002 | 3,062 | | 2001 | 2,962 | | 2000 | 2,863 | | 1999 | 2,771 | | 1998 | 2,674 | | 1997 | 2,573 | | 1996 | 2,483 | | 1995 | 2,401 | | 1994 | 2,315 | | 1993 | 2,226 | | 1992 | 2,138 | | 1991 | 2,065 | | 1990 | 2,007 | | 1989 | 1,953 | | 1988 | 1,913 | | 1987 | 1,880 | | 1986 | 1,852 | | 1985 | 1,836 | | 1984 | 1,827 | | 1983 | 1,825 | | 1982 | 1,828 | | 1981 | 1,833 | | 1980 | 1,844 | | 1979 | 1,860 | | 1978 | 1,877 | | 1977 | 1,887 | | 1976 | 1,893 | | 1975 | 1,893 | | 1974 | 1,886 | | 1973 | 1,872 | | 1972 | 1,848 | | 1971 | 1,818 | | 1970 | 1,784 | | 1969 | 1,755 | | 1968 | 1,735 | | 1967 | 1,717 | | 1966 | 1,701 | | 1965 | 1,686 | | 1964 | 1,672 | | 1963 | 1,657 | | 1962 | 1,642 | | 1961 | 1,625 | | 1960 | 1,609 |
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