Year	US Dollars
1970	8123000
1971	8629000
1972	9488000
1973	8259000
1974	10153000
1975	14084000
1976	16202000
1977	24592000
1978	34001000
1979	53128000
1980	71943000
1981	84408000
1982	122069000
1983	128674000
1984	138034000
1985	175286000
1986	197620000
1987	258628000
1988	287086000
1989	328145000
1990	395586000
1991	447387000
1992	494404000
1993	542370000
1994	622551000
1995	684359000
1996	701225000
1997	672946000
1998	688209000
1999	687189000
2000	769690000
2001	684410000
2002	712574000
2003	705755000
2004	773436000
2005	666297000
2006	657438000
2007	685486000
2008	696917000
2009	760050000
2010	779040000
2011	802850000
2012	868132000
2013	900775000
2014	894503000
2015	888419000
2016	883326000