Year | Value | 2019 | 3 | 2018 | 3 | 2017 | 3 | 2016 | 611 | 2015 | 10,728 | 2014 | 10,928.727 | 2013 | 10,956 | 2012 | 11,034.545454545 | 2011 | 10,603 | 2010 | 10,067 | 2009 | 10,351 | 2008 | 13,071 | 2007 | 15,170 | 2006 | 14,092 | 2005 | 12,249 | 2004 | 12,022 | 2003 | 14,024 | 2002 | 14,959 | 2001 | 29,905 | 2000 | 31,479 | 1999 | 28,900 | 1998 | 12,700 | 1997 | 12,500 | 1996 | 12,500 | 1995 | 12,500 | 1994 | 12,500 | 1993 | 12,500 | 1992 | 12,500 | 1991 | 12,500 | 1990 | 12,500 | 1989 | 12,500 | 1988 | 12,500 | 1987 | 12,500 | 1986 | 12,500 | 1985 | 9,400 | 1984 | 9,400 | 1983 | 5,800 | 1982 | 5,800 | 1981 | 5,800 | 1980 | 5,800 |
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