Year	US Dollars
1970	0
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	0
1983	0
1984	0
1985	0
1986	0
1987	0
1988	0
1989	0
1990	0
1991	0
1992	0
1993	0
1994	0
1995	0
1996	0
1997	0
1998	0
1999	75994000
2000	72140000
2001	69583000
2002	75274000
2003	82276000
2004	85988000
2005	79136000
2006	83296000
2007	534738000
2008	709873000
2009	1725716000
2010	1455550000
2011	1699829000
2012	2002396000
2013	2220795000
2014	2242256000
2015	2158196000
2016	2152306000