Year	current US$
1981	19096404323.2673
1982	20642338233.0211
1983	22550038999.8207
1984	27726825552.721
1985	36730918485.0286
1986	23943075817.1902
1987	23078591869.7619
1988	25299915450.5252
1989	13725600880.1146
1990	19338605591.4505
1991	19707373020.894
1992	22223922981.9693
1993	13625726011.0375
1994	18228270040.1683
1995	23783632198.6924
1996	29410870428.75
1997	30324325086.2706
1998	34059536902.2727
1999	31733092843.5824
2000	29751518868.2492
2001	46085896264.8103
2002	62929096778.688
2003	69709167978.6167
2004	87655675693.0649
2005	114138340393.36
2006	131436056652.186
2007	208427176913.887
2008	234440874005.028
2009	224013654538.531
2010	276178343890.138
2011	310873402067.832
2012	312594101278.481
2013	418037250471.677
2014	451531687950.245
2015	423998926402.11
2016	351719602385.48
2017	317618212655.021