Year	current US$
1990	-502088047.822882
1991	-715167096.699945
1992	-646452968.817754
1993	-741277693.503006
1994	-798606064.59902
1995	-593507935.397294
1996	-568585596.639748
1997	-483792399.932126
1998	390123083.202242
1999	125552985.729211
2000	495931913.831007
2001	641118261.588137
2002	1283194974.42557
2003	1793203772.36375
2004	2534057848.78704
2005	3000766144.79084
2006	3476040263.17952
2007	3785195908.60575
2008	5595147988.52657
2009	4931500683.013
2010	3237455394.06973
2011	1565481850.97847
2012	1276164841.45684
2013	4048670004.15183
2014	6277268145.45207
2015	6041299306.14205
2016	8186841670.07286
2017	10879766989.493
2018	13204634853.2141
2019	16408996887.465
2020	16563310343.6088