| Year | Value | | 2022 | 11,652 | | 2021 | 11,461 | | 2020 | 11,147 | | 2019 | 10,929 | | 2018 | 10,692 | | 2017 | 10,338 | | 2016 | 10,253 | | 2015 | 10,446 | | 2014 | 10,691 | | 2013 | 10,935 | | 2012 | 11,097 | | 2011 | 11,068 | | 2010 | 11,008 | | 2009 | 10,980 | | 2008 | 10,856 | | 2007 | 10,671 | | 2006 | 10,522 | | 2005 | 10,378 | | 2004 | 10,143 | | 2003 | 9,895 | | 2002 | 9,641 | | 2001 | 9,383 | | 2000 | 9,111 | | 1999 | 8,847 | | 1998 | 8,631 | | 1997 | 8,412 | | 1996 | 8,111 | | 1995 | 7,815 | | 1994 | 7,573 | | 1993 | 7,278 | | 1992 | 6,990 | | 1991 | 6,714 | | 1990 | 6,401 | | 1989 | 6,075 | | 1988 | 5,719 | | 1987 | 5,391 | | 1986 | 5,239 | | 1985 | 5,218 | | 1984 | 5,254 | | 1983 | 5,314 | | 1982 | 5,378 | | 1981 | 5,428 | | 1980 | 5,520 | | 1979 | 5,618 | | 1978 | 5,650 | | 1977 | 5,644 | | 1976 | 5,611 | | 1975 | 5,477 | | 1974 | 5,303 | | 1973 | 5,251 | | 1972 | 5,219 | | 1971 | 5,164 | | 1970 | 5,141 | | 1969 | 5,092 | | 1968 | 4,989 | | 1967 | 4,893 | | 1966 | 4,764 | | 1965 | 4,638 | | 1964 | 4,597 | | 1963 | 4,563 | | 1962 | 4,496 | | 1961 | 4,470 | | 1960 | 4,430 |
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