Year	current US$
1990	-165411390.167251
1991	-122698947.398723
1992	-196918911.73748
1993	-106984407.145128
1994	-187845847.920081
1995	-268120439.267562
1996	-303671851.882203
1997	-268311661.337646
1998	-319288339.674316
1999	-186571620.698217
2000	-212943346.550178
2001	-247727085.587443
2002	-254412833.552762
2003	-347073625.141256
2004	-314876533.198448
2005	-242865715.530191
2006	-317064807.358774
2007	-485620216.567525
2008	-716143897.651691
2009	-523293204.232837
2010	-578329105.968175
2011	-696437758.939612
2012	-349152932.569985
2013	-529730384.236786
2014	-656577032.639638
2015	-375214825.831506
2016	-536545560.80789
2017	-537738108.048147
2018	-473333122.631352