Year | Value | 2012 | 2,145 | 2011 | 2,085 | 2009 | 186 | 2008 | 181 | 2007 | 183 | 2006 | 171 | 2005 | 164 | 2004 | 156 | 2003 | 138 | 2002 | 138 | 2001 | 139 | 2000 | 202 | 1996 | 200 | 1995 | 200 | 1994 | 200 | 1993 | 100 | 1992 | 100 | 1990 | 500 | 1989 | 700 | 1988 | 1,500 | 1987 | 1,900 | 1986 | 3,100 | 1985 | 3,100 | 1984 | 3,100 | 1983 | 600 | 1982 | 600 | 1981 | 600 | 1980 | 3,200 | 1979 | 3,100 | 1978 | 3,100 | 1977 | 3,100 | 1976 | 3,000 | 1975 | 1,900 |
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