Year	US Dollars
1970	24141000
1971	28420000
1972	36812000
1973	56155000
1974	68571000
1975	79157000
1976	94577000
1977	131961000
1978	142361000
1979	157822000
1980	194662000
1981	233381000
1982	253473000
1983	257905000
1984	263621000
1985	343526000
1986	461863000
1987	617836000
1988	668831000
1989	693534000
1990	698507000
1991	794177000
1992	813886000
1993	875128000
1994	888056000
1995	945981000
1996	932750000
1997	882963000
1998	918822000
1999	924196000
2000	869008000
2001	834817000
2002	1084773000
2003	1063244000
2004	1094313000
2005	1025954000
2006	1027582000
2007	1008445000
2008	989007000
2009	536612000
2010	615160000
2011	549297000
2012	537098000
2013	556292000
2014	641780000
2015	661851000
2016	682203000