| Year | Value | | 2022 | 12,345 | | 2021 | 11,966 | | 2020 | 11,555 | | 2019 | 11,041 | | 2018 | 10,594 | | 2017 | 10,220 | | 2016 | 9,876 | | 2015 | 9,738 | | 2014 | 9,748 | | 2013 | 9,729 | | 2012 | 9,632 | | 2011 | 9,531 | | 2010 | 9,447 | | 2009 | 9,329 | | 2008 | 9,164 | | 2007 | 9,101 | | 2006 | 9,204 | | 2005 | 9,378 | | 2004 | 9,567 | | 2003 | 9,692 | | 2002 | 9,770 | | 2001 | 9,749 | | 2000 | 9,711 | | 1999 | 9,645 | | 1998 | 9,514 | | 1997 | 9,395 | | 1996 | 9,231 | | 1995 | 9,135 | | 1994 | 8,944 | | 1993 | 8,405 | | 1992 | 7,820 | | 1991 | 7,338 | | 1990 | 6,926 | | 1989 | 6,867 | | 1988 | 7,251 | | 1987 | 7,805 | | 1986 | 8,304 | | 1985 | 8,600 | | 1984 | 8,668 | | 1983 | 8,690 | | 1982 | 8,681 | | 1981 | 8,632 | | 1980 | 8,590 | | 1979 | 8,504 | | 1978 | 8,383 | | 1977 | 8,297 | | 1976 | 8,249 | | 1975 | 8,170 | | 1974 | 8,032 | | 1973 | 7,836 | | 1972 | 7,570 | | 1971 | 7,312 | | 1970 | 7,077 | | 1969 | 6,817 | | 1968 | 6,615 | | 1967 | 6,424 | | 1966 | 6,201 | | 1965 | 5,990 | | 1964 | 5,784 | | 1963 | 5,587 | | 1962 | 5,437 | | 1961 | 5,343 | | 1960 | 5,269 |
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