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	133923000
1994	214330000
1995	370657000
1996	520544000
1997	638485000
1998	804243000
1999	1022596000
2000	1009643000
2001	1401649000
2002	1711690000
2003	1994268000
2004	2106357000
2005	1968027000
2006	2136305000
2007	3078652000
2008	3609420000
2009	4932728000
2010	6304799000
2011	7408641000
2012	7638570000
2013	8679111000
2014	8553131000
2015	8928447000
2016	9953091000