Year	US Dollars
1980	-25700000
1981	-42350000
1982	-40500000
1983	-30100000
1984	-16250000
1985	-26800000
1986	-5950000
1987	-5900000
1988	-18350000
1989	-34100000
1990	8900000
1991	-47050000
1992	-16582450
1993	-19559250
1994	-15139050
1995	-7131600
1996	-1683350
1997	-19157450
1998	-29945200
1999	-90105950
2000	-172250000
2001	-158950000
2002	-126550000
2003	-126284150
2004	-84128650
2005	-89523350
2006	-6305650
2007	-1597350
2008	-99659350
2009	-61489350
2010	10346100
2011	-44753700
2012	-7385400
2013	-88805600
2014	-93751200
2015	-161428900
2016	-196803150
2017	-162000000