Year	US Dollars
1970	4085000
1971	4339000
1972	5070000
1973	4826000
1974	5274000
1975	4827000
1976	9166000
1977	20670000
1978	33313000
1979	71829000
1980	63043000
1981	60228000
1982	69804000
1983	100640000
1984	98759000
1985	118126000
1986	121871000
1987	137195000
1988	132277000
1989	137218000
1990	142753000
1991	161782000
1992	180961000
1993	194553000
1994	198666000
1995	255158000
1996	281537000
1997	450096000
1998	333460000
1999	416579000
2000	629902000
2001	721981000
2002	849529000
2003	1061730000
2004	964609000
2005	1021919000
2006	1053036000
2007	1074411000
2008	1274805000
2009	1290299000
2010	1303110000
2011	1274029000
2012	1195808000
2013	1248229000
2014	1286020000
2015	1330547000
2016	1344359000