Year	current US$
1990	2714882.18870544
1991	-22171699.9801085
1992	-416340512.036798
1993	1137890543.9016
1994	1069461120.08223
2009	-2245437519.5148
2010	-2146781281.9865
2011	-2466954019.98336
2012	-4783172733.59314
2013	-3460414056.09827
2014	-3639307489.09364
2015	-4648715242.98046
2016	-3784871888.04197
2017	-3049241869.99469
2018	758199482.088096
2019	1217168929.53594
2020	305902910.713041