Year	US Dollars
1970	1455000
1971	739000
1972	775000
1973	2787000
1974	3191000
1975	3449000
1976	3738000
1977	4744000
1978	5688000
1979	7235000
1980	10629000
1981	18815000
1982	21222000
1983	25596000
1984	24935000
1985	27182000
1986	31362000
1987	41506000
1988	48278000
1989	52730000
1990	62708000
1991	68856000
1992	76246000
1993	101712000
1994	114174000
1995	118296000
1996	122494000
1997	117723000
1998	136301000
1999	193800000
2000	195078000
2001	195044000
2002	175623000
2003	199273000
2004	228633000
2005	252622000
2006	243483000
2007	201948000
2008	232178000
2009	246042000
2010	295920000
2011	304062000
2012	288066000
2013	311726000
2014	340851000
2015	341293000
2016	370127000