Year	US Dollars
1970	716253000
1971	693955000
1972	809514000
1973	851175000
1974	946415000
1975	1080565000
1976	1360673000
1977	1803420000
1978	2238360000
1979	2633583000
1980	2784674000
1981	3310318000
1982	3422088000
1983	4164922000
1984	4412206000
1985	4898178000
1986	5670013000
1987	5934541000
1988	4997496000
1989	4229853000
1990	4369980000
1991	4158856000
1992	4333091000
1993	4402331000
1994	4971960000
1995	5370881000
1996	5290867000
1997	5326931000
1998	5702788000
1999	5668250000
2000	5899507000
2001	4800375000
2002	5115267000
2003	5875335000
2004	6296917000
2005	6978720000
2006	6268444000
2007	5113326000
2008	5720273000
2009	5810820000
2010	5806031000
2011	6210956000
2012	6663588000
2013	8201283000
2014	8917172000
2015	9913846000
2016	11015313000