Year | Value | 2021 | 9.328 | 2020 | 44 | 2019 | 526 | 2018 | 472 | 2017 | 460 | 2016 | 522 | 2015 | 483 | 2014 | 498.34024896266 | 2013 | 3,576 | 2012 | 890 | 2011 | 732 | 2010 | 725 | 2009 | 1,865 | 2008 | 1,986 | 2007 | 1,949 | 2006 | 1,839 | 2005 | 1,768 | 2004 | 1,652 | 2003 | 1,354 | 2002 | 1,396 | 2001 | 1,305 | 2000 | 1,332 | 1999 | 1,300 | 1998 | 1,000 | 1997 | 6,900 | 1996 | 6,400 | 1995 | 6,400 | 1994 | 6,100 | 1993 | 6,100 | 1992 | 6,100 | 1991 | 5,800 | 1990 | 5,800 | 1989 | 5,800 | 1988 | 5,800 | 1987 | 5,500 | 1986 | 5,400 | 1985 | 5,500 | 1984 | 5,400 | 1983 | 5,400 | 1982 | 5,600 | 1981 | 5,600 | 1980 | 5,700 | 1979 | 5,500 | 1978 | 4,900 | 1977 | 4,900 | 1971 | 9,100 | 1970 | 7,600 |
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