Year	current US$
1977	10242499312.5843
1978	11570857539.5991
1979	18180398924.0677
1980	22081026693.9675
1981	26146846748.1768
1982	22411280672.8767
1983	21591579163.549
1984	21792238946.8576
1985	22080041451.125
1986	20450542094.9073
1987	22093431890.829
1988	25093332003.6174
1989	23501393253.0284
1990	27337195896.3762
1991	27952365523.5923
1992	34357363969.7529
1993	34379017293.6121
1994	37253327402.4592
1995	39546110689.2694
1996	41281080859.0185
1997	43471103696.8275
1998	43828288873.2026
1999	48294518808.9491
2000	48517513642.9022
2001	48640565698.6363
2002	50867888420.1297
2003	65037570704.5327
2004	79120858882.1922
2005	95711254527.2797
2006	114179943563.065
2007	135789133160.609
2008	151774953855.598
2009	144187711528.765
2010	152645477749.483
2011	142045823511.842
2012	152961003455.739
2013	148144685908.086
2014	159744859810.819
2015	158561690516.442
2016	157344367561.01
2017	175476903503.688
2018	195926004666.575