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	14434000
1982	20520000
1983	39154000
1984	51479000
1985	58688000
1986	61404000
1987	75386000
1988	76654000
1989	80619000
1990	90753000
1991	98103000
1992	97712000
1993	98251000
1994	99702000
1995	104870000
1996	116471000
1997	105115000
1998	113901000
1999	134175000
2000	183326000
2001	232893000
2002	248883000
2003	307393000
2004	324952000
2005	294218000
2006	272826000
2007	265528000
2008	260472000
2009	271883000
2010	271398000
2011	280446000
2012	304780000
2013	309858000
2014	308228000
2015	314211000
2016	297065000