Year | Value | 2022 | 57,964 | 2021 | 55,993 | 2020 | 54,351 | 2019 | 51,923 | 2018 | 48,983 | 2017 | 46,206 | 2016 | 43,140 | 2015 | 39,190 | 2014 | 34,486 | 2013 | 29,777 | 2012 | 26,096 | 2011 | 24,935 | 2010 | 27,397 | 2009 | 33,088 | 2008 | 40,457 | 2007 | 47,411 | 2006 | 52,057 | 2005 | 53,792 | 2004 | 53,107 | 2003 | 51,065 | 2002 | 48,969 | 2001 | 47,663 | 2000 | 47,666 | 1999 | 49,301 | 1998 | 51,816 | 1997 | 53,895 | 1996 | 54,880 | 1995 | 54,286 | 1994 | 51,965 | 1993 | 48,032 | 1992 | 42,501 | 1991 | 36,135 | 1990 | 30,106 | 1989 | 24,742 | 1988 | 20,703 | 1987 | 18,311 | 1986 | 16,892 | 1985 | 16,390 | 1984 | 16,890 | 1983 | 18,141 | 1982 | 19,978 | 1981 | 22,296 | 1980 | 24,573 | 1979 | 26,342 | 1978 | 27,522 | 1977 | 28,156 | 1976 | 28,280 | 1975 | 27,970 | 1974 | 27,359 | 1973 | 26,578 | 1972 | 25,674 | 1971 | 24,634 | 1970 | 23,470 | 1969 | 22,214 | 1968 | 20,897 | 1967 | 19,576 | 1966 | 18,359 | 1965 | 17,314 | 1964 | 16,447 | 1963 | 15,770 | 1962 | 15,363 | 1961 | 15,333 | 1960 | 15,768 |
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