Year	current US$
1990	194490062.989439
1991	148074121.452923
1992	-278372651.372558
1993	1261268667.30579
1994	1184387209.38303
2009	-2055675628.90305
2010	-1942306355.84528
2011	-2243777167.30168
2012	-4531454600.76773
2013	-3169114872.97151
2014	-3320211270.8566
2015	-4311261757.87485
2016	-3434953190.37752
2017	-2765910855.02465
2018	1279156145.56618
2019	1564375523.18188
2020	659906074.262872