| Year | Value | | 2022 | 10,469 | | 2021 | 10,052 | | 2020 | 9,618 | | 2019 | 9,168 | | 2018 | 8,704 | | 2017 | 8,197 | | 2016 | 7,625 | | 2015 | 7,003 | | 2014 | 6,354 | | 2013 | 5,707 | | 2012 | 5,115 | | 2011 | 4,640 | | 2010 | 4,319 | | 2009 | 4,140 | | 2008 | 4,073 | | 2007 | 4,094 | | 2006 | 4,172 | | 2005 | 4,288 | | 2004 | 4,437 | | 2003 | 4,609 | | 2002 | 4,775 | | 2001 | 4,907 | | 2000 | 4,997 | | 1999 | 5,102 | | 1998 | 5,225 | | 1997 | 5,316 | | 1996 | 5,374 | | 1995 | 5,388 | | 1994 | 5,358 | | 1993 | 5,285 | | 1992 | 5,173 | | 1991 | 5,031 | | 1990 | 4,874 | | 1989 | 4,711 | | 1988 | 4,547 | | 1987 | 4,392 | | 1986 | 4,255 | | 1985 | 4,135 | | 1984 | 4,029 | | 1983 | 3,946 | | 1982 | 3,886 | | 1981 | 3,848 | | 1980 | 3,825 | | 1979 | 3,822 | | 1978 | 3,833 | | 1977 | 3,847 | | 1976 | 3,865 | | 1975 | 3,884 | | 1974 | 3,908 | | 1973 | 3,939 | | 1972 | 3,969 | | 1971 | 3,991 | | 1970 | 4,005 | | 1969 | 3,987 | | 1968 | 3,940 | | 1967 | 3,886 | | 1966 | 3,827 | | 1965 | 3,765 | | 1964 | 3,697 | | 1963 | 3,628 | | 1962 | 3,556 | | 1961 | 3,500 | | 1960 | 3,432 |
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