| Year | Value | | 2022 | 17,004 | | 2021 | 16,024 | | 2020 | 15,153 | | 2019 | 14,312 | | 2018 | 13,530 | | 2017 | 12,813 | | 2016 | 12,162 | | 2015 | 11,582 | | 2014 | 11,100 | | 2013 | 10,707 | | 2012 | 10,381 | | 2011 | 10,111 | | 2010 | 9,879 | | 2009 | 9,652 | | 2008 | 9,451 | | 2007 | 9,295 | | 2006 | 9,159 | | 2005 | 9,006 | | 2004 | 8,800 | | 2003 | 8,578 | | 2002 | 8,339 | | 2001 | 8,085 | | 2000 | 7,862 | | 1999 | 7,694 | | 1998 | 7,539 | | 1997 | 7,384 | | 1996 | 7,220 | | 1995 | 7,024 | | 1994 | 6,842 | | 1993 | 6,683 | | 1992 | 6,532 | | 1991 | 6,379 | | 1990 | 6,243 | | 1989 | 6,122 | | 1988 | 6,015 | | 1987 | 5,927 | | 1986 | 5,866 | | 1985 | 5,853 | | 1984 | 5,856 | | 1983 | 5,846 | | 1982 | 5,818 | | 1981 | 5,775 | | 1980 | 5,703 | | 1979 | 5,583 | | 1978 | 5,429 | | 1977 | 5,257 | | 1976 | 5,046 | | 1975 | 4,786 | | 1974 | 4,511 | | 1973 | 4,257 | | 1972 | 4,038 | | 1971 | 3,857 | | 1970 | 3,748 | | 1969 | 3,648 | | 1968 | 3,478 | | 1967 | 3,264 | | 1966 | 3,040 | | 1965 | 2,838 | | 1964 | 2,677 | | 1963 | 2,588 | | 1962 | 2,569 | | 1961 | 2,575 | | 1960 | 2,605 |
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