Year | Value | 2022 | 25,396 | 2021 | 24,856 | 2020 | 24,497 | 2019 | 24,144 | 2018 | 23,672 | 2017 | 23,208 | 2016 | 22,524 | 2015 | 21,906 | 2014 | 21,258 | 2013 | 20,590 | 2012 | 20,062 | 2011 | 19,856 | 2010 | 19,837 | 2009 | 19,796 | 2008 | 19,792 | 2007 | 19,845 | 2006 | 19,919 | 2005 | 19,859 | 2004 | 19,786 | 2003 | 19,724 | 2002 | 19,512 | 2001 | 19,216 | 2000 | 18,687 | 1999 | 18,195 | 1998 | 17,855 | 1997 | 17,426 | 1996 | 17,067 | 1995 | 16,717 | 1994 | 16,367 | 1993 | 16,041 | 1992 | 15,716 | 1991 | 15,283 | 1990 | 14,832 | 1989 | 14,479 | 1988 | 14,123 | 1987 | 13,785 | 1986 | 13,523 | 1985 | 13,217 | 1984 | 12,797 | 1983 | 12,458 | 1982 | 12,224 | 1981 | 12,004 | 1980 | 11,852 | 1979 | 11,852 | 1978 | 11,902 | 1977 | 11,876 | 1976 | 11,836 | 1975 | 11,804 | 1974 | 11,650 | 1973 | 11,410 | 1972 | 11,314 | 1971 | 11,418 | 1970 | 11,695 | 1969 | 12,012 | 1968 | 12,209 | 1967 | 12,398 | 1966 | 12,495 | 1965 | 12,344 | 1964 | 12,116 | 1963 | 12,016 | 1962 | 11,858 | 1961 | 11,646 | 1960 | 11,623 |
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