Year	US Dollars
1990	187562624178.57001
1991	198107058487.436
1992	205673898563.29102
1993	210594112682.20404
1994	223735523533.54105
1995	233269478371.51495
1996	237702475780.40894
1997	249264550583.83405
1998	256341669710.30893
1999	268170007344.194
2000	294082652230.28198
2001	303542176567.05292
2002	320209435474.63605
2003	328166754831.58997
2004	340526519489.92889
2005	353373783903.79803
2006	378365671957.33295
2007	396869683797.83502
2008	417983366784.32202
2009	410793823698.25201
2010	450583017477.36395
2011	460300440792.34399
2012	482866602524.88293
2013	494697245976.63501
2014	503754370705.83606
2015	511030882677.77209
2016	529781351066.49097
2017	548603821199.51892