Year	US Dollars
1993	17766283365.8118
1994	15431591188.5998
1995	14220068850.1105
1996	15444407820.5439
1997	14298694810.6026
1998	15149662339.0779
1999	17656595642.2735
2000	17925258428.2022
2001	19768412450.9649
2002	20171117583.4594
2003	21559536329.005
2004	23198843593.667
2005	25587855094.2949
2006	30531097038.7158
2007	34827271405.3233
2008	39683225103.05479
2009	42045892417.033
2010	45399906979.27789
2011	52404098571.8364
2012	59426964175.26149
2013	67100923052.16229
2014	75095895213.80222
2015	83651648055.222
2016	93041246910.04701
2017	99753609269.35287