Year | Value | 2016 | 2,305 | 2015 | 2,765 | 2012 | 1,553 | 2011 | 3,002 | 2010 | 7,516.1598513011 | 2009 | 5,423 | 2008 | 5,654 | 2007 | 9,057 | 2006 | 8,524 | 2005 | 8,505 | 2004 | 8,342 | 2003 | 7,990 | 2002 | 7,474 | 2001 | 7,492 | 2000 | 7,445 | 1999 | 7,300 | 1998 | 10,100 | 1997 | 10,000 | 1996 | 7,100 | 1995 | 12,000 | 1994 | 12,000 | 1993 | 10,900 | 1992 | 10,800 | 1991 | 11,300 | 1990 | 10,400 | 1989 | 10,700 | 1988 | 11,000 | 1987 | 12,500 | 1986 | 12,300 | 1985 | 12,300 | 1984 | 12,600 | 1983 | 13,100 | 1982 | 12,600 | 1981 | 12,200 | 1980 | 12,000 | 1979 | 11,800 | 1978 | 11,600 | 1977 | 12,100 | 1976 | 12,700 | 1975 | 11,300 | 1974 | 11,200 | 1973 | 11,300 | 1972 | 11,000 | 1971 | 11,200 | 1970 | 11,200 |
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