Year | Value | 2021 | 1,356 | 2020 | 675 | 2019 | 3,417.3 | 2018 | 3,777 | 2017 | 1,953 | 2016 | 3,828 | 2015 | 2,332 | 2014 | 6,864 | 2013 | 8,616 | 2012 | 5,990 | 2011 | 4,879 | 2010 | 6,290 | 2009 | 359 | 2008 | 349 | 2007 | 353 | 2006 | 330 | 2005 | 317 | 2004 | 302 | 2003 | 263 | 2002 | 263 | 2001 | 266 | 2000 | 263 | 1999 | 3,000 | 1998 | 900 | 1997 | 900 | 1996 | 900 | 1995 | 900 | 1994 | 1,500 | 1993 | 1,500 | 1992 | 500 | 1991 | 800 | 1990 | 2,000 | 1989 | 2,000 | 1988 | 1,200 | 1987 | 1,700 | 1986 | 1,800 | 1985 | 1,100 | 1984 | 2,100 | 1983 | 3,100 | 1982 | 2,800 | 1981 | 2,700 | 1980 | 1,500 | 1976 | 2,800 | 1975 | 2,200 | 1974 | 1,200 | 1973 | 1,700 | 1972 | 7,300 | 1971 | 10,100 | 1970 | 10,500 |
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