| Year | Value | | 2022 | 17,316 | | 2021 | 17,002 | | 2020 | 16,646 | | 2019 | 16,167 | | 2018 | 15,612 | | 2017 | 14,984 | | 2016 | 14,294 | | 2015 | 13,554 | | 2014 | 12,947 | | 2013 | 12,516 | | 2012 | 12,139 | | 2011 | 11,873 | | 2010 | 11,732 | | 2009 | 11,473 | | 2008 | 11,097 | | 2007 | 10,713 | | 2006 | 10,303 | | 2005 | 9,944 | | 2004 | 9,647 | | 2003 | 9,369 | | 2002 | 9,087 | | 2001 | 8,799 | | 2000 | 8,508 | | 1999 | 8,216 | | 1998 | 7,914 | | 1997 | 7,612 | | 1996 | 7,372 | | 1995 | 7,224 | | 1994 | 7,116 | | 1993 | 7,010 | | 1992 | 6,908 | | 1991 | 6,818 | | 1990 | 6,701 | | 1989 | 6,555 | | 1988 | 6,422 | | 1987 | 6,307 | | 1986 | 6,160 | | 1985 | 5,984 | | 1984 | 5,835 | | 1983 | 5,721 | | 1982 | 5,630 | | 1981 | 5,550 | | 1980 | 5,474 | | 1979 | 5,394 | | 1978 | 5,303 | | 1977 | 5,192 | | 1976 | 5,065 | | 1975 | 4,927 | | 1974 | 4,774 | | 1973 | 4,611 | | 1972 | 4,447 | | 1971 | 4,281 | | 1970 | 4,113 | | 1969 | 3,954 | | 1968 | 3,813 | | 1967 | 3,682 | | 1966 | 3,551 | | 1965 | 3,447 | | 1964 | 3,382 | | 1963 | 3,342 | | 1962 | 3,332 | | 1961 | 3,348 | | 1960 | 3,369 |
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