Year	current US$
1981	189942947698.195
1982	161854990504.134
1983	101830373450.238
1984	64949193821.4712
1985	53624489932.8318
1986	51686655295.977
1987	48110528288.6633
1988	43244753474.3084
1989	45014017388.2312
1990	51209086974.1111
1991	47031469739.1189
1992	43457156127.2188
1993	32060998389.5367
1994	34118422509.1604
1995	38775055740.9278
1996	41930259775.7496
1997	44183956770.9951
1998	44313943419.1048
1999	42957196729.4828
2000	46505080442.0854
2001	45241633551.1107
2002	47140398257.9209
2003	54489746659.6067
2004	63879505405.8303
2005	78729831685.5576
2006	106315720147.373
2007	106720856658.891
2008	125228646813.821
2009	120972834565.381
2010	124224053829.245
2011	136475619880.678
2012	144482986522.594
2013	156433120453.621
2014	177447060394.538
2015	166824778668.93
2016	150824344707.86
2017	150662593999.869