Year	current US$
1981	166106078653.805
1982	143329618153.558
1983	96102478596.5235
1984	71043929205.721
1985	70942250509.4691
1986	54059213276.7238
1987	49410138332.1679
1988	46968602692.1811
1989	36822231461.8683
1990	48078453982.701
1991	43483502705.4025
1992	43148249459.2912
1993	25972365269.3157
1994	32466439577.2762
1995	40192347725.9807
1996	48117672551.25
1997	51278316043.8748
1998	56236945014.7727
1999	54497628307.2751
2000	53440171373.2813
2001	68980445224.5006
2002	89238899377.3336
2003	100539430503.535
2004	124640778407.381
2005	160267135092.703
2006	197227813836.117
2007	266982775632.888
2008	301500816805.291
2009	288371884752.155
2010	339991981374.336
2011	378006445709.001
2012	381311364855.358
2013	494787341492.532
2014	541369885331.429
2015	500610375913.465
2016	413901027596.926
2017	375762300375.65