Year | Value | 2022 | 24,508 | 2021 | 24,837 | 2020 | 24,988 | 2019 | 25,155 | 2018 | 24,924 | 2017 | 24,458 | 2016 | 24,299 | 2015 | 24,115 | 2014 | 23,944 | 2013 | 23,795 | 2012 | 23,697 | 2011 | 23,749 | 2010 | 23,864 | 2009 | 23,905 | 2008 | 23,884 | 2007 | 23,814 | 2006 | 23,710 | 2005 | 23,584 | 2004 | 23,422 | 2003 | 23,212 | 2002 | 22,927 | 2001 | 22,546 | 2000 | 22,086 | 1999 | 21,563 | 1998 | 21,005 | 1997 | 20,456 | 1996 | 19,955 | 1995 | 19,513 | 1994 | 19,130 | 1993 | 18,778 | 1992 | 18,433 | 1991 | 18,014 | 1990 | 17,517 | 1989 | 16,982 | 1988 | 16,416 | 1987 | 15,884 | 1986 | 15,430 | 1985 | 15,082 | 1984 | 14,845 | 1983 | 14,701 | 1982 | 14,629 | 1981 | 14,606 | 1980 | 14,615 | 1979 | 14,626 | 1978 | 14,617 | 1977 | 14,582 | 1976 | 14,524 | 1975 | 14,438 | 1974 | 14,324 | 1973 | 14,192 | 1972 | 14,053 | 1971 | 13,921 | 1970 | 13,861 | 1969 | 13,879 | 1968 | 13,899 | 1967 | 13,891 | 1966 | 13,821 | 1965 | 13,647 | 1964 | 13,353 | 1963 | 12,967 | 1962 | 12,548 | 1961 | 12,156 | 1960 | 11,883 |
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