Year | Value | 2022 | 20,438 | 2021 | 19,671 | 2020 | 19,220 | 2019 | 18,540 | 2018 | 17,581 | 2017 | 16,616 | 2016 | 15,869 | 2015 | 15,426 | 2014 | 14,985 | 2013 | 14,535 | 2012 | 14,201 | 2011 | 13,951 | 2010 | 13,645 | 2009 | 13,247 | 2008 | 12,844 | 2007 | 12,503 | 2006 | 12,267 | 2005 | 12,081 | 2004 | 12,068 | 2003 | 12,248 | 2002 | 12,491 | 2001 | 12,774 | 2000 | 13,211 | 1999 | 13,689 | 1998 | 14,083 | 1997 | 14,427 | 1996 | 14,653 | 1995 | 14,700 | 1994 | 14,574 | 1993 | 14,411 | 1992 | 14,195 | 1991 | 13,929 | 1990 | 13,552 | 1989 | 13,622 | 1988 | 13,810 | 1987 | 14,092 | 1986 | 14,465 | 1985 | 14,553 | 1984 | 14,303 | 1983 | 14,038 | 1982 | 13,286 | 1981 | 12,146 | 1980 | 11,147 | 1979 | 10,241 | 1978 | 9,503 | 1977 | 9,025 | 1976 | 8,924 | 1975 | 9,023 | 1974 | 9,200 | 1973 | 9,469 | 1972 | 9,705 | 1971 | 9,856 | 1970 | 9,855 | 1969 | 9,793 | 1968 | 9,738 | 1967 | 9,674 | 1966 | 9,655 | 1965 | 9,711 | 1964 | 9,784 | 1963 | 9,838 | 1962 | 9,898 | 1961 | 9,938 | 1960 | 9,951 |
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