Year | Value | 2022 | 16,621 | 2021 | 16,418 | 2020 | 16,285 | 2019 | 16,074 | 2018 | 15,851 | 2017 | 15,708 | 2016 | 15,566 | 2015 | 15,502 | 2014 | 15,286 | 2013 | 14,930 | 2012 | 14,620 | 2011 | 14,421 | 2010 | 14,140 | 2009 | 13,910 | 2008 | 13,734 | 2007 | 13,519 | 2006 | 13,389 | 2005 | 13,412 | 2004 | 13,520 | 2003 | 13,568 | 2002 | 13,669 | 2001 | 13,756 | 2000 | 13,757 | 1999 | 13,755 | 1998 | 13,758 | 1997 | 13,720 | 1996 | 13,544 | 1995 | 13,304 | 1994 | 12,994 | 1993 | 12,661 | 1992 | 12,306 | 1991 | 11,899 | 1990 | 11,427 | 1989 | 10,917 | 1988 | 10,545 | 1987 | 10,345 | 1986 | 10,264 | 1985 | 10,295 | 1984 | 10,404 | 1983 | 10,418 | 1982 | 10,357 | 1981 | 10,255 | 1980 | 10,101 | 1979 | 10,002 | 1978 | 9,905 | 1977 | 9,867 | 1976 | 10,028 | 1975 | 10,228 | 1974 | 10,385 | 1973 | 10,615 | 1972 | 10,980 | 1971 | 11,360 | 1970 | 11,696 | 1969 | 12,001 | 1968 | 12,269 | 1967 | 12,536 | 1966 | 12,679 | 1965 | 12,631 | 1964 | 12,511 | 1963 | 12,382 | 1962 | 12,208 | 1961 | 12,034 | 1960 | 11,871 |
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