Year	US Dollars
1970	151676000
1971	172356000
1972	177713000
1973	175532000
1974	202067000
1975	209213000
1976	243894000
1977	300753000
1978	426835000
1979	588278000
1980	690505000
1981	707179000
1982	874406000
1983	1009043000
1984	1074246000
1985	1238563000
1986	1422908000
1987	1935602000
1988	1940761000
1989	2196167000
1990	2605824000
1991	2803290000
1992	2951348000
1993	3052839000
1994	3397570000
1995	3608771000
1996	3710233000
1997	3907825000
1998	3941897000
1999	3537936000
2000	3535146000
2001	3768225000
2002	4019809000
2003	4578283000
2004	4790127000
2005	4461213000
2006	1300725000
2007	1653064000
2008	2292857000
2009	2763177000
2010	2974599000
2011	3262582000
2012	3779371000
2013	8739157000
2014	8952316000
2015	9925262000
2016	9946994000