Year | Value | 2022 | 12,189 | 2021 | 12,015 | 2020 | 12,152 | 2019 | 12,113 | 2018 | 11,821 | 2017 | 11,538 | 2016 | 11,305 | 2015 | 11,006 | 2014 | 10,701 | 2013 | 10,533 | 2012 | 10,383 | 2011 | 10,200 | 2010 | 10,106 | 2009 | 10,017 | 2008 | 9,878 | 2007 | 9,782 | 2006 | 9,758 | 2005 | 9,854 | 2004 | 10,042 | 2003 | 10,301 | 2002 | 10,716 | 2001 | 11,279 | 2000 | 11,697 | 1999 | 11,949 | 1998 | 12,221 | 1997 | 12,501 | 1996 | 12,721 | 1995 | 13,046 | 1994 | 13,519 | 1993 | 13,870 | 1992 | 13,998 | 1991 | 13,996 | 1990 | 13,754 | 1989 | 13,699 | 1988 | 13,647 | 1987 | 13,763 | 1986 | 13,897 | 1985 | 13,832 | 1984 | 13,828 | 1983 | 14,028 | 1982 | 13,930 | 1981 | 13,823 | 1980 | 13,987 | 1979 | 13,948 | 1978 | 13,787 | 1977 | 13,508 | 1976 | 13,234 | 1975 | 12,889 | 1974 | 12,450 | 1973 | 12,139 | 1972 | 11,930 | 1971 | 11,777 | 1970 | 11,671 | 1969 | 11,928 | 1968 | 12,535 | 1967 | 13,366 | 1966 | 14,443 | 1965 | 15,807 | 1964 | 17,178 | 1963 | 18,338 | 1962 | 19,383 | 1961 | 20,223 | 1960 | 20,761 |
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