Year | Value | 2021 | 11,513 | 2020 | 12,546 | 2019 | 35,175 | 2018 | 33,475 | 2017 | 32,589 | 2016 | 29,892 | 2015 | 35,127 | 2014 | 36,216 | 2013 | 36,564 | 2012 | 36,648.073787979 | 2011 | 36,648.073787979 | 2010 | 28,909 | 2009 | 14,247 | 2008 | 15,017 | 2007 | 14,703 | 2006 | 13,878 | 2005 | 14,298 | 2004 | 17,483 | 2003 | 17,731 | 2002 | 23,076 | 2001 | 27,908 | 2000 | 25,982 | 1999 | 20,900 | 1998 | 12,500 | 1997 | 12,400 | 1996 | 13,700 | 1995 | 29,400 | 1994 | 28,000 | 1993 | 23,900 | 1992 | 23,100 | 1991 | 23,400 | 1990 | 21,500 | 1989 | 21,800 | 1988 | 21,300 | 1987 | 20,000 | 1986 | 25,000 | 1985 | 22,800 | 1984 | 23,300 | 1983 | 23,200 | 1982 | 24,200 | 1981 | 13,700 | 1980 | 15,100 | 1979 | 12,200 | 1978 | 8,300 | 1977 | 11,800 | 1976 | 13,600 | 1975 | 12,100 | 1974 | 8,000 | 1973 | 9,000 | 1972 | 9,400 | 1971 | 10,300 | 1970 | 12,500 |
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