Year	current US$
1990	-425358322.513221
1991	-716635282.161265
1992	-958026867.613217
1993	-936131003.278022
1994	-547499760.266341
1995	-465379052.501873
1996	-680178853.723495
1997	-684707658.921225
1998	-869634109.168961
1999	-1321464396.75597
2000	-337620560.840859
2001	-804331636.352716
2002	-303824160.691175
2003	-20027908.5966563
2004	-257186737.156148
2005	1130351588.23422
2006	2423293467.58323
2007	4508128554.24692
2008	3812561096.27129
2009	1206433903.16027
2010	1190327180.74538
2011	-1456184645.26483
2012	2719701863.89614
2013	1466098087.79753
2014	1400443446.73862
2015	1162918454.59534
2016	2575674975.64625
2017	3679972425.8187
2018	2346612611.37774