Year	current US$
1981	577871120.0079198
1982	551498543.1734823
1983	495060937.36064005
1984	456283158.6685665
1985	468269213.8814043
1986	705160319.8070326
1990	1955257477.203073
1998	2498002592.0018096
1999	2524677049.6863027
2000	2225111423.64042
2001	2293746045.369365
2002	2510447501.0295734
2003	3147912773.8655
2004	3676410678.8029275
2005	3965911461.213101
2006	4287711462.219693
2007	5018998667.647422
2008	5849036873.482408
2009	5666139614.808729
2010	5759369754.853339
2011	6387155738.315301
2012	6154688527.379579
2013	6489076971.775061
2014	6673748266.547144
2015	5710558178.101831
2016	5740518298.954308
2017	6018805965.305678