Year | Value | 2021 | 11,231 | 2020 | 9,831.363 | 2019 | 44,051 | 2018 | 70,828 | 2017 | 50,387 | 2016 | 43,878 | 2015 | 38,304 | 2014 | 48,975 | 2013 | 54,948 | 2012 | 44,189 | 2011 | 61,476 | 2010 | 72,137 | 2009 | 78,153 | 2008 | 78,377 | 2007 | 75,830 | 2006 | 75,439 | 2005 | 75,295 | 2004 | 66,134 | 2003 | 52,127 | 2002 | 46,574 | 2001 | 44,164 | 2000 | 40,027 | 1999 | 34,800 | 1998 | 29,500 | 1997 | 28,300 | 1996 | 26,900 | 1995 | 26,100 | 1994 | 23,500 | 1993 | 24,800 | 1992 | 23,100 | 1991 | 20,200 | 1990 | 22,300 | 1989 | 24,200 | 1988 | 22,100 | 1987 | 21,800 | 1986 | 22,200 | 1985 | 21,700 | 1984 | 20,900 | 1983 | 20,000 | 1982 | 18,700 | 1981 | 29,300 | 1980 | 39,100 | 1979 | 48,000 | 1978 | 47,000 | 1977 | 46,100 | 1976 | 60,300 | 1975 | 46,000 | 1974 | 42,200 | 1973 | 38,900 | 1972 | 39,900 | 1971 | 31,900 | 1970 | 12,500 |
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