Year	US Dollars
1979	42270000.45776
1980	150399993.89648
1981	1150449951.17188
1982	1290459960.9375
1983	1623530029.29688
1984	1941719970.70313
1985	2318879882.8125
1986	2035349975.58594
1987	2242810058.59375
1988	2912090087.89063
1989	3148969970.70313
1990	2874679931.64063
1991	2623590087.89063
1992	3757939941.40625
1993	3945780029.29688
1994	3595620117.1875
1995	3626120117.1875
1996	3044570068.35938
1997	2632280029.29688
1998	3106669921.875
1999	2867000000
2000	2209110107.42188
2001	2011859985.35156
2002	1951060058.59375
2003	1574430053.71094
2004	1813219970.70313
2005	1907089965.82031
2006	1380069946.28906
2007	1465189941.40625
2008	1227449951.17188
2009	1087479980.46875
2010	695830017.08984
2011	-523580017.08984
2012	-9109999.65668
2013	-648630004.88281
2014	-978559997.55859
2015	-367489990.23438
2016	-790539978.02734
2017	-1045479980.46875
2018	-751880004.88281
2019	-620830017.08984
2020	-572809997.55859
2021	-610710021.97266