Year | Value | 2021 | 29,475 | 2020 | 17,591 | 2019 | 57,321 | 2018 | 57,094 | 2017 | 54,474 | 2016 | 55,592 | 2015 | 57,444 | 2014 | 55,980 | 2013 | 52,452 | 2012 | 63,711.979170666 | 2011 | 60,778.716260319 | 2010 | 62,473 | 2009 | 69,808 | 2004 | 32,488 | 2003 | 28,508 | 2002 | 19,752 | 2001 | 20,492 | 2000 | 21,303 | 1999 | 20,900 | 1998 | 12,300 | 1997 | 14,400 | 1996 | 15,400 | 1995 | 13,400 | 1994 | 15,200 | 1993 | 14,700 | 1992 | 12,900 | 1991 | 10,000 | 1990 | 10,900 | 1989 | 10,000 | 1988 | 9,400 | 1987 | 8,800 | 1986 | 9,600 | 1985 | 10,500 | 1984 | 10,100 | 1983 | 9,500 | 1982 | 8,700 | 1981 | 10,000 | 1980 | 9,500 | 1979 | 8,300 | 1978 | 7,200 | 1977 | 6,300 | 1976 | 6,200 | 1975 | 5,400 | 1974 | 4,700 | 1973 | 8,800 | 1972 | 8,300 | 1971 | 7,700 | 1970 | 8,300 |
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