| Year | Value | | 2022 | 23,145 | | 2021 | 22,178 | | 2020 | 20,922 | | 2019 | 19,496 | | 2018 | 17,924 | | 2017 | 16,386 | | 2016 | 14,967 | | 2015 | 13,695 | | 2014 | 12,615 | | 2013 | 11,875 | | 2012 | 11,424 | | 2011 | 11,073 | | 2010 | 10,790 | | 2009 | 10,540 | | 2008 | 10,299 | | 2007 | 10,047 | | 2006 | 9,761 | | 2005 | 9,431 | | 2004 | 9,092 | | 2003 | 8,787 | | 2002 | 8,518 | | 2001 | 8,274 | | 2000 | 8,044 | | 1999 | 7,793 | | 1998 | 7,474 | | 1997 | 7,073 | | 1996 | 6,614 | | 1995 | 6,140 | | 1994 | 5,699 | | 1993 | 5,295 | | 1992 | 4,912 | | 1991 | 4,563 | | 1990 | 4,251 | | 1989 | 3,978 | | 1988 | 3,763 | | 1987 | 3,600 | | 1986 | 3,479 | | 1985 | 3,400 | | 1984 | 3,406 | | 1983 | 3,466 | | 1982 | 3,517 | | 1981 | 3,558 | | 1980 | 3,585 | | 1979 | 3,591 | | 1978 | 3,576 | | 1977 | 3,556 | | 1976 | 3,542 | | 1975 | 3,533 | | 1974 | 3,523 | | 1973 | 3,503 | | 1972 | 3,475 | | 1971 | 3,441 | | 1970 | 3,401 | | 1969 | 3,348 | | 1968 | 3,285 | | 1967 | 3,170 | | 1966 | 2,952 | | 1965 | 2,687 | | 1964 | 2,517 | | 1963 | 2,441 | | 1962 | 2,377 | | 1961 | 2,313 | | 1960 | 2,241 |
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