Year	current US$
1981	253106700
1982	321168100
1983	241578700
1984	251793182.5
1985	260991186.20000002
1986	253274415.2
1987	245121285.5
1988	317645286
1989	387254088.29999995
1990	423135067
1991	495887789.4
1992	574458561.4
1993	421130189.8
1994	160575615.6
1995	650632433.5
1996	908589323.5
1997	619735368.6
1998	794646824.5
1999	899102879.8
2000	1093516280
2001	1325610043
2002	1492909869
2003	1850305830
2004	2294031026
2005	2602868252
2006	3005121651
2007	4051193236
2008	5243405560
2009	4440214175
2010	4537932772
2011	5318646828
2012	4875039515
2013	4931341128
2014	5284111574
2015	4364943626
2016	4666089101
2017	5670492837
2018	6406219819
2019	6483079415
2020	6022684914