Year	US Dollars
1970	82702000
1971	156518000
1972	158272000
1973	178347000
1974	220850000
1975	328515000
1976	426535000
1977	526378000
1978	610959000
1979	686675000
1980	842486000
1981	916736000
1982	1006137000
1983	1254032000
1984	1313769000
1985	1526060000
1986	1663707000
1987	1765608000
1988	1893970000
1989	1660091000
1990	1963016000
1991	1977501000
1992	1913418000
1993	1967648000
1994	2051773000
1995	2118365000
1996	1607219000
1997	1590392000
1998	1480769000
1999	1433423000
2000	1374370000
2001	1327497000
2002	1390050000
2003	1454033000
2004	1368287000
2005	1238712000
2006	1163026000
2007	848521000
2008	990392000
2009	1427811000
2010	1408289000
2011	2006563000
2012	1974118000
2013	2301906000
2014	2341843000
2015	1639012000
2016	1638937000