| Year | Value | | 2022 | 32,990 | | 2021 | 32,343 | | 2020 | 31,594 | | 2019 | 30,753 | | 2018 | 29,864 | | 2017 | 28,979 | | 2016 | 28,005 | | 2015 | 26,280 | | 2014 | 24,446 | | 2013 | 23,137 | | 2012 | 21,965 | | 2011 | 20,757 | | 2010 | 19,371 | | 2009 | 18,147 | | 2008 | 17,000 | | 2007 | 15,883 | | 2006 | 14,312 | | 2005 | 12,850 | | 2004 | 12,061 | | 2003 | 11,381 | | 2002 | 10,811 | | 2001 | 10,316 | | 2000 | 9,882 | | 1999 | 9,512 | | 1998 | 9,198 | | 1997 | 8,923 | | 1996 | 8,651 | | 1995 | 8,339 | | 1994 | 7,967 | | 1993 | 7,546 | | 1992 | 7,119 | | 1991 | 6,729 | | 1990 | 6,405 | | 1989 | 6,178 | | 1988 | 6,030 | | 1987 | 5,904 | | 1986 | 5,771 | | 1985 | 5,623 | | 1984 | 5,460 | | 1983 | 5,286 | | 1982 | 5,117 | | 1981 | 4,977 | | 1980 | 4,880 | | 1979 | 4,824 | | 1978 | 4,807 | | 1977 | 4,821 | | 1976 | 4,849 | | 1975 | 4,888 | | 1974 | 4,937 | | 1973 | 4,986 | | 1972 | 5,013 | | 1971 | 4,986 | | 1970 | 4,883 | | 1969 | 4,694 | | 1968 | 4,431 | | 1967 | 4,142 | | 1966 | 3,878 | | 1965 | 3,666 | | 1964 | 3,507 | | 1963 | 3,394 | | 1962 | 3,309 | | 1961 | 3,231 | | 1960 | 3,159 |
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