| Year | Value | | 2022 | 5,654 | | 2021 | 5,766 | | 2020 | 5,798 | | 2019 | 5,752 | | 2018 | 5,634 | | 2017 | 5,445 | | 2016 | 5,191 | | 2015 | 4,890 | | 2014 | 4,556 | | 2013 | 4,215 | | 2012 | 3,907 | | 2011 | 3,659 | | 2010 | 3,481 | | 2009 | 3,374 | | 2008 | 3,324 | | 2007 | 3,304 | | 2006 | 3,300 | | 2005 | 3,298 | | 2004 | 3,290 | | 2003 | 3,288 | | 2002 | 3,306 | | 2001 | 3,349 | | 2000 | 3,436 | | 1999 | 3,561 | | 1998 | 3,691 | | 1997 | 3,815 | | 1996 | 3,918 | | 1995 | 3,994 | | 1994 | 4,041 | | 1993 | 4,048 | | 1992 | 4,010 | | 1991 | 3,928 | | 1990 | 3,813 | | 1989 | 3,681 | | 1988 | 3,547 | | 1987 | 3,405 | | 1986 | 3,242 | | 1985 | 3,058 | | 1984 | 2,860 | | 1983 | 2,660 | | 1982 | 2,481 | | 1981 | 2,347 | | 1980 | 2,274 | | 1979 | 2,264 | | 1978 | 2,267 | | 1977 | 2,245 | | 1976 | 2,198 | | 1975 | 2,139 | | 1974 | 2,081 | | 1973 | 2,037 | | 1972 | 2,016 | | 1971 | 2,019 | | 1970 | 2,058 | | 1969 | 2,171 | | 1968 | 2,323 | | 1967 | 2,451 | | 1966 | 2,549 | | 1965 | 2,615 | | 1964 | 2,651 | | 1963 | 2,656 | | 1962 | 2,642 | | 1961 | 2,619 | | 1960 | 2,586 |
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