| Year | Value | | 2022 | 7,660 | | 2021 | 7,251 | | 2020 | 6,922 | | 2019 | 6,672 | | 2018 | 6,367 | | 2017 | 6,074 | | 2016 | 5,822 | | 2015 | 5,532 | | 2014 | 5,229 | | 2013 | 4,933 | | 2012 | 4,656 | | 2011 | 4,501 | | 2010 | 4,452 | | 2009 | 4,455 | | 2008 | 4,511 | | 2007 | 4,577 | | 2006 | 4,611 | | 2005 | 4,664 | | 2004 | 4,714 | | 2003 | 4,723 | | 2002 | 4,705 | | 2001 | 4,670 | | 2000 | 4,545 | | 1999 | 4,380 | | 1998 | 4,312 | | 1997 | 4,269 | | 1996 | 4,207 | | 1995 | 4,174 | | 1994 | 4,128 | | 1993 | 4,018 | | 1992 | 3,914 | | 1991 | 3,798 | | 1990 | 3,666 | | 1989 | 3,608 | | 1988 | 3,579 | | 1987 | 3,519 | | 1986 | 3,485 | | 1985 | 3,438 | | 1984 | 3,356 | | 1983 | 3,295 | | 1982 | 3,225 | | 1981 | 3,131 | | 1980 | 3,088 | | 1979 | 3,075 | | 1978 | 3,021 | | 1977 | 2,954 | | 1976 | 2,887 | | 1975 | 2,838 | | 1974 | 2,786 | | 1973 | 2,726 | | 1972 | 2,703 | | 1971 | 2,705 | | 1970 | 2,697 | | 1969 | 2,671 | | 1968 | 2,650 | | 1967 | 2,634 | | 1966 | 2,630 | | 1965 | 2,544 | | 1964 | 2,431 | | 1963 | 2,349 | | 1962 | 2,214 | | 1961 | 2,069 | | 1960 | 1,996 |
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