| Year | Value | | 2022 | 17,679 | | 2021 | 17,031 | | 2020 | 16,458 | | 2019 | 15,717 | | 2018 | 14,837 | | 2017 | 13,892 | | 2016 | 13,063 | | 2015 | 12,366 | | 2014 | 11,779 | | 2013 | 11,429 | | 2012 | 11,263 | | 2011 | 11,087 | | 2010 | 10,899 | | 2009 | 10,737 | | 2008 | 10,633 | | 2007 | 10,579 | | 2006 | 10,546 | | 2005 | 10,504 | | 2004 | 10,445 | | 2003 | 10,377 | | 2002 | 10,291 | | 2001 | 10,178 | | 2000 | 10,031 | | 1999 | 9,842 | | 1998 | 9,595 | | 1997 | 9,321 | | 1996 | 9,093 | | 1995 | 8,951 | | 1994 | 8,882 | | 1993 | 8,897 | | 1992 | 8,941 | | 1991 | 8,901 | | 1990 | 8,722 | | 1989 | 8,420 | | 1988 | 8,009 | | 1987 | 7,510 | | 1986 | 7,008 | | 1985 | 6,556 | | 1984 | 6,142 | | 1983 | 5,746 | | 1982 | 5,376 | | 1981 | 5,025 | | 1980 | 4,688 | | 1979 | 4,376 | | 1978 | 4,107 | | 1977 | 3,878 | | 1976 | 3,690 | | 1975 | 3,558 | | 1974 | 3,497 | | 1973 | 3,513 | | 1972 | 3,587 | | 1971 | 3,662 | | 1970 | 3,679 | | 1969 | 3,620 | | 1968 | 3,478 | | 1967 | 3,276 | | 1966 | 3,094 | | 1965 | 2,992 | | 1964 | 2,969 | | 1963 | 3,021 | | 1962 | 3,134 | | 1961 | 3,256 | | 1960 | 3,340 |
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