Year	current US$
1990	832185903.0392848
1998	721022217.2409421
1999	823995031.2464627
2000	746710637.1080393
2001	760944675.2235633
2002	924430911.672937
2003	1418526748.8938
2004	1481920672.6854503
2005	1774613575.1449797
2006	2436050808.340332
2007	3182911990.1717463
2008	3744611122.3493977
2009	3260878420.36063
2010	4032996398.9413347
2011	4436218213.294758
2012	4049379152.725756
2013	3834592682.8605127
2014	3720161134.5077033
2015	3069968123.878079
2016	2586663908.1521525
2017	2558933291.7100077