Year	US Dollars
1990	45427351048.39351
1991	49679887081.3022
1992	52641250881.52871
1993	55348815873.7902
1994	59182467245.03119
1995	62008316925.03409
1996	64051336237.0514
1997	68256595285.5584
1998	70854115761.96809
1999	66762625427.52589
2000	68254141933.2252
2001	74378623589.64091
2002	79504422426.45389
2003	83110047417.1701
2004	91993900728.8098
2005	100667833997.37598
2006	108857295248.12701
2007	114259453730.06799
2008	125897967504.88599
2009	127939743887.06001
2010	134808391633.72899
2011	148275025674.849
2012	159698051140.397
2013	170368972149.043
2014	179845027287.099
2015	181566967291.061
2016	180744409465.88602
2017	188767386493.64102