| Year | Value | | 2022 | 39,449 | | 2021 | 37,777 | | 2020 | 36,367 | | 2019 | 34,971 | | 2018 | 33,757 | | 2017 | 32,797 | | 2016 | 31,987 | | 2015 | 31,240 | | 2014 | 30,529 | | 2013 | 29,820 | | 2012 | 29,089 | | 2011 | 28,359 | | 2010 | 27,635 | | 2009 | 26,884 | | 2008 | 26,054 | | 2007 | 25,176 | | 2006 | 24,354 | | 2005 | 23,641 | | 2004 | 23,021 | | 2003 | 22,526 | | 2002 | 22,107 | | 2001 | 21,589 | | 2000 | 20,892 | | 1999 | 20,040 | | 1998 | 19,073 | | 1997 | 18,003 | | 1996 | 17,008 | | 1995 | 16,315 | | 1994 | 15,924 | | 1993 | 15,847 | | 1992 | 16,023 | | 1991 | 16,224 | | 1990 | 16,305 | | 1989 | 16,276 | | 1988 | 16,158 | | 1987 | 15,677 | | 1986 | 14,938 | | 1985 | 14,287 | | 1984 | 13,692 | | 1983 | 13,128 | | 1982 | 12,622 | | 1981 | 12,155 | | 1980 | 11,719 | | 1979 | 11,326 | | 1978 | 10,986 | | 1977 | 10,657 | | 1976 | 10,267 | | 1975 | 9,766 | | 1974 | 9,366 | | 1973 | 9,048 | | 1972 | 8,615 | | 1971 | 8,191 | | 1970 | 7,866 | | 1969 | 7,640 | | 1968 | 7,518 | | 1967 | 7,479 | | 1966 | 7,421 | | 1965 | 7,262 | | 1964 | 7,000 | | 1963 | 6,630 | | 1962 | 6,173 | | 1961 | 5,741 | | 1960 | 5,421 |
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