| Year | Value | | 2022 | 36,532 | | 2021 | 35,539 | | 2020 | 34,951 | | 2019 | 34,348 | | 2018 | 33,548 | | 2017 | 32,732 | | 2016 | 31,887 | | 2015 | 31,022 | | 2014 | 30,079 | | 2013 | 29,043 | | 2012 | 27,942 | | 2011 | 26,781 | | 2010 | 25,573 | | 2009 | 24,397 | | 2008 | 23,345 | | 2007 | 22,430 | | 2006 | 21,619 | | 2005 | 20,904 | | 2004 | 20,292 | | 2003 | 19,732 | | 2002 | 19,172 | | 2001 | 18,597 | | 2000 | 17,966 | | 1999 | 17,245 | | 1998 | 16,466 | | 1997 | 15,660 | | 1996 | 14,889 | | 1995 | 14,214 | | 1994 | 13,630 | | 1993 | 13,135 | | 1992 | 12,712 | | 1991 | 12,304 | | 1990 | 11,883 | | 1989 | 11,460 | | 1988 | 11,048 | | 1987 | 10,643 | | 1986 | 10,251 | | 1985 | 9,878 | | 1984 | 9,515 | | 1983 | 9,159 | | 1982 | 8,806 | | 1981 | 8,446 | | 1980 | 8,074 | | 1979 | 7,709 | | 1978 | 7,347 | | 1977 | 6,978 | | 1976 | 6,632 | | 1975 | 6,335 | | 1974 | 6,081 | | 1973 | 5,869 | | 1972 | 5,731 | | 1971 | 5,611 | | 1970 | 5,460 | | 1969 | 5,324 | | 1968 | 5,215 | | 1967 | 5,125 | | 1966 | 5,034 | | 1965 | 4,930 | | 1964 | 4,807 | | 1963 | 4,653 | | 1962 | 4,471 | | 1961 | 4,299 | | 1960 | 4,164 |
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