Year | Value | 2022 | 18,236 | 2021 | 18,602 | 2020 | 18,830 | 2019 | 18,950 | 2018 | 18,848 | 2017 | 18,576 | 2016 | 18,257 | 2015 | 17,893 | 2014 | 17,479 | 2013 | 17,128 | 2012 | 16,760 | 2011 | 16,208 | 2010 | 15,538 | 2009 | 14,840 | 2008 | 14,192 | 2007 | 13,653 | 2006 | 13,321 | 2005 | 13,295 | 2004 | 13,473 | 2003 | 13,746 | 2002 | 14,152 | 2001 | 14,704 | 2000 | 15,401 | 1999 | 16,217 | 1998 | 17,052 | 1997 | 17,822 | 1996 | 18,516 | 1995 | 19,099 | 1994 | 19,610 | 1993 | 19,978 | 1992 | 20,115 | 1991 | 20,101 | 1990 | 19,953 | 1989 | 19,833 | 1988 | 19,633 | 1987 | 19,077 | 1986 | 18,234 | 1985 | 17,295 | 1984 | 16,564 | 1983 | 16,113 | 1982 | 15,664 | 1981 | 15,160 | 1980 | 14,693 | 1979 | 14,267 | 1978 | 13,875 | 1977 | 13,544 | 1976 | 13,213 | 1975 | 12,831 | 1974 | 12,505 | 1973 | 12,265 | 1972 | 11,986 | 1971 | 11,605 | 1970 | 11,192 | 1969 | 10,802 | 1968 | 10,449 | 1967 | 10,175 | 1966 | 9,891 | 1965 | 9,446 | 1964 | 9,022 | 1963 | 8,704 | 1962 | 8,369 | 1961 | 8,020 | 1960 | 7,662 |
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