Year | Value | 2022 | 19,953 | 2021 | 20,487 | 2020 | 20,917 | 2019 | 20,879 | 2018 | 20,191 | 2017 | 19,210 | 2016 | 18,186 | 2015 | 17,196 | 2014 | 16,177 | 2013 | 15,320 | 2012 | 14,827 | 2011 | 14,635 | 2010 | 14,596 | 2009 | 14,597 | 2008 | 14,542 | 2007 | 14,407 | 2006 | 14,268 | 2005 | 14,245 | 2004 | 14,180 | 2003 | 13,984 | 2002 | 13,758 | 2001 | 13,504 | 2000 | 13,115 | 1999 | 12,658 | 1998 | 12,258 | 1997 | 11,933 | 1996 | 11,695 | 1995 | 11,541 | 1994 | 11,594 | 1993 | 11,829 | 1992 | 12,127 | 1991 | 12,444 | 1990 | 12,678 | 1989 | 13,148 | 1988 | 13,505 | 1987 | 13,827 | 1986 | 14,073 | 1985 | 14,000 | 1984 | 13,768 | 1983 | 13,770 | 1982 | 13,546 | 1981 | 13,231 | 1980 | 13,236 | 1979 | 13,396 | 1978 | 13,685 | 1977 | 14,029 | 1976 | 14,507 | 1975 | 14,849 | 1974 | 14,863 | 1973 | 14,714 | 1972 | 14,257 | 1971 | 13,460 | 1970 | 12,472 | 1969 | 11,523 | 1968 | 10,727 | 1967 | 10,192 | 1966 | 10,038 | 1965 | 10,231 | 1964 | 10,631 | 1963 | 11,096 | 1962 | 11,531 | 1961 | 11,861 | 1960 | 12,082 |
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