Year	US Dollars
1970	0
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	0
1983	0
1984	0
1985	24549000
1986	28928000
1987	36095000
1988	37559000
1989	39139000
1990	53685000
1991	44996000
1992	43483000
1993	44243000
1994	58638000
1995	64116000
1996	63805000
1997	58678000
1998	64880000
1999	78049000
2000	73965000
2001	71355000
2002	81496000
2003	93415000
2004	94358000
2005	89030000
2006	91617000
2007	96868000
2008	98959000
2009	114892000
2010	153651000
2011	190596000
2012	197465000
2013	199068000
2014	194485000
2015	173710000
2016	159855000