Year | Value | 2022 | 22,688 | 2021 | 22,588 | 2020 | 22,309 | 2019 | 21,781 | 2018 | 21,059 | 2017 | 20,259 | 2016 | 19,393 | 2015 | 18,496 | 2014 | 18,022 | 2013 | 17,950 | 2012 | 17,876 | 2011 | 17,903 | 2010 | 18,154 | 2009 | 18,124 | 2008 | 17,918 | 2007 | 17,827 | 2006 | 18,035 | 2005 | 18,655 | 2004 | 19,248 | 2003 | 19,805 | 2002 | 20,319 | 2001 | 20,788 | 2000 | 21,200 | 1999 | 21,501 | 1998 | 21,628 | 1997 | 21,539 | 1996 | 21,306 | 1995 | 20,949 | 1994 | 20,446 | 1993 | 19,892 | 1992 | 19,327 | 1991 | 18,763 | 1990 | 18,235 | 1989 | 17,762 | 1988 | 17,343 | 1987 | 16,976 | 1986 | 16,702 | 1985 | 16,437 | 1984 | 16,102 | 1983 | 15,752 | 1982 | 15,396 | 1981 | 15,010 | 1980 | 14,584 | 1979 | 14,109 | 1978 | 13,595 | 1977 | 13,044 | 1976 | 12,446 | 1975 | 11,782 | 1974 | 11,075 | 1973 | 10,394 | 1972 | 9,771 | 1971 | 9,221 | 1970 | 8,747 | 1969 | 8,352 | 1968 | 8,032 | 1967 | 7,774 | 1966 | 7,501 | 1965 | 7,236 | 1964 | 7,053 | 1963 | 6,902 | 1962 | 6,763 | 1961 | 6,636 | 1960 | 6,510 |
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