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	1320000
1982	1340000
1983	1360000
1984	1380000
1985	1400000
1986	24348000
1987	28011000
1988	26950000
1989	91460000
1990	102607000
1991	1536011000
1992	1512194000
1993	1495419000
1994	1580938000
1995	1691747000
1996	1754429000
1997	1769230000
1998	1839566000
1999	1905499000
2000	1946022000
2001	2016579000
2002	2229060000
2003	2519451000
2004	2725537000
2005	2768997000
2006	2859744000
2007	2064040000
2008	2466050000
2009	3120649000
2010	3684860000
2011	4227457000
2012	6282779000
2013	7131526000
2014	7930289000
2015	9327818000
2016	10230215000