Year | Value | 2021 | 373 | 2020 | 2,743 | 2019 | 2,668 | 2018 | 3,225 | 2017 | 3,385 | 2016 | 3,309 | 2015 | 2,995 | 2014 | 2,796 | 2013 | 3,420 | 2012 | 2,417.5132978723 | 2011 | 1,914.7606382979 | 2010 | 1,925 | 2009 | 4,560 | 2008 | 4,900 | 2007 | 5,022 | 2006 | 4,908 | 2005 | 4,851 | 2004 | 4,620 | 2003 | 4,402 | 2002 | 1,714 | 2001 | 1,920 | 2000 | 2,169 | 1999 | 6,800 | 1998 | 6,300 | 1997 | 6,200 | 1996 | 3,800 | 1995 | 2,600 | 1994 | 3,100 | 1993 | 3,600 | 1992 | 3,000 | 1991 | 2,700 | 1990 | 2,100 | 1989 | 2,100 | 1988 | 2,200 | 1987 | 700 | 1986 | 800 | 1985 | 2,800 | 1984 | 2,800 | 1983 | 2,600 | 1982 | 2,600 | 1981 | 3,100 | 1980 | 3,100 | 1979 | 3,100 | 1978 | 2,800 | 1977 | 1,400 | 1976 | 1,400 |
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