| Year | Value | | 2022 | 34,763 | | 2021 | 33,757 | | 2020 | 32,372 | | 2019 | 31,086 | | 2018 | 30,131 | | 2017 | 29,502 | | 2016 | 29,410 | | 2015 | 29,225 | | 2014 | 28,221 | | 2013 | 27,591 | | 2012 | 27,212 | | 2011 | 26,554 | | 2010 | 25,700 | | 2009 | 24,928 | | 2008 | 24,240 | | 2007 | 23,608 | | 2006 | 23,000 | | 2005 | 22,376 | | 2004 | 21,726 | | 2003 | 21,057 | | 2002 | 20,344 | | 2001 | 19,554 | | 2000 | 18,683 | | 1999 | 17,730 | | 1998 | 16,687 | | 1997 | 15,597 | | 1996 | 14,543 | | 1995 | 13,584 | | 1994 | 12,729 | | 1993 | 11,988 | | 1992 | 11,366 | | 1991 | 10,815 | | 1990 | 10,303 | | 1989 | 9,833 | | 1988 | 9,401 | | 1987 | 9,010 | | 1986 | 8,682 | | 1985 | 8,417 | | 1984 | 8,195 | | 1983 | 8,010 | | 1982 | 7,838 | | 1981 | 7,652 | | 1980 | 7,453 | | 1979 | 7,247 | | 1978 | 7,042 | | 1977 | 6,846 | | 1976 | 6,673 | | 1975 | 6,531 | | 1974 | 6,414 | | 1973 | 6,314 | | 1972 | 6,219 | | 1971 | 6,113 | | 1970 | 5,987 | | 1969 | 5,840 | | 1968 | 5,677 | | 1967 | 5,509 | | 1966 | 5,355 | | 1965 | 5,227 | | 1964 | 5,124 | | 1963 | 5,034 | | 1962 | 4,953 | | 1961 | 4,897 | | 1960 | 4,880 |
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