Year	current US$
1980	223000000
1981	214000000
1982	192000000
1983	238000000
1984	262000000
1985	248000000
1986	336000000
1987	513000000
1988	478000000
1989	346000000
1990	338000000
1991	303000000
1992	334000000
1993	219000000
1994	242000000
1995	315000000
1996	370000000
1997	358000000
1998	387000000
1999	470000000
2000	533000000
2001	500000000
2002	494000000
2003	738000000
2004	628000000
2005	743000000
2006	790000000
2007	1015837000
2008	988076000
2009	783440000
2010	780024000
2011	987201000
2012	1153117000
2013	1115200000
2014	1072552426.58888
2015	910313043.863418
2016	979286416.929527
2017	1096198681.39617