| Year | Value | | 2022 | 7,626 | | 2021 | 7,399 | | 2020 | 7,187 | | 2019 | 6,960 | | 2018 | 6,695 | | 2017 | 6,351 | | 2016 | 5,976 | | 2015 | 5,642 | | 2014 | 5,385 | | 2013 | 5,239 | | 2012 | 5,204 | | 2011 | 5,226 | | 2010 | 5,261 | | 2009 | 5,288 | | 2008 | 5,284 | | 2007 | 5,239 | | 2006 | 5,188 | | 2005 | 5,181 | | 2004 | 5,228 | | 2003 | 5,200 | | 2002 | 5,067 | | 2001 | 4,900 | | 2000 | 4,679 | | 1999 | 4,413 | | 1998 | 4,112 | | 1997 | 3,800 | | 1996 | 3,511 | | 1995 | 3,259 | | 1994 | 3,114 | | 1993 | 3,069 | | 1992 | 3,032 | | 1991 | 2,981 | | 1990 | 2,911 | | 1989 | 2,812 | | 1988 | 2,688 | | 1987 | 2,570 | | 1986 | 2,473 | | 1985 | 2,406 | | 1984 | 2,391 | | 1983 | 2,432 | | 1982 | 2,519 | | 1981 | 2,633 | | 1980 | 2,755 | | 1979 | 2,849 | | 1978 | 2,908 | | 1977 | 2,950 | | 1976 | 2,965 | | 1975 | 2,945 | | 1974 | 2,894 | | 1973 | 2,823 | | 1972 | 2,757 | | 1971 | 2,694 | | 1970 | 2,655 | | 1969 | 2,662 | | 1968 | 2,708 | | 1967 | 2,799 | | 1966 | 2,931 | | 1965 | 3,087 | | 1964 | 3,178 | | 1963 | 3,017 | | 1962 | 2,649 | | 1961 | 2,393 | | 1960 | 2,282 |
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