Year | Value | 2022 | 23,626 | 2021 | 22,458 | 2020 | 21,095 | 2019 | 19,720 | 2018 | 18,980 | 2017 | 18,516 | 2016 | 18,395 | 2015 | 18,366 | 2014 | 18,263 | 2013 | 17,874 | 2012 | 17,338 | 2011 | 16,630 | 2010 | 16,007 | 2009 | 15,583 | 2008 | 15,409 | 2007 | 15,461 | 2006 | 15,557 | 2005 | 15,539 | 2004 | 15,242 | 2003 | 14,562 | 2002 | 13,673 | 2001 | 12,853 | 2000 | 12,225 | 1999 | 11,979 | 1998 | 12,138 | 1997 | 12,462 | 1996 | 12,837 | 1995 | 13,154 | 1994 | 13,328 | 1993 | 13,380 | 1992 | 13,317 | 1991 | 13,189 | 1990 | 13,105 | 1989 | 13,144 | 1988 | 13,366 | 1987 | 13,734 | 1986 | 14,093 | 1985 | 14,344 | 1984 | 14,446 | 1983 | 14,390 | 1982 | 14,198 | 1981 | 13,895 | 1980 | 13,539 | 1979 | 13,195 | 1978 | 12,912 | 1977 | 12,705 | 1976 | 12,570 | 1975 | 12,530 | 1974 | 12,568 | 1973 | 12,629 | 1972 | 12,590 | 1971 | 12,332 | 1970 | 11,889 | 1969 | 11,419 | 1968 | 11,024 | 1967 | 10,851 | 1966 | 10,948 | 1965 | 11,090 | 1964 | 11,101 | 1963 | 10,985 | 1962 | 10,456 | 1961 | 9,567 | 1960 | 8,717 |
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