Year	current US$
1981	28699000
1982	36410000
1983	30789000
1984	38316183.86
1985	93061022.25
1986	87106613.08
1987	108343606.4
1988	119178549.39999999
1989	122070783.19999999
1990	144461868.7
1991	162797167.1
1992	418300000
1993	379010000
1994	258399999.99999997
1995	415310000
1996	450940000
1997	468260000
1998	503280000
1999	512750000
2000	614463995
2001	637586087
2002	580130546
2003	801391500
2004	1011342200
2005	1160297200
2006	1434895006
2007	2059238893.0000002
2008	3244270411
2009	3476796773
2010	4569228183
2011	7975102784
2012	8437556465
2013	6398112813
2014	5162271746
2015	3817544351
2016	3350213417
2017	4335276239
2018	5875154862
2019	6137283416
2020	5336303787