Year	US Dollars
1990	25762322376.34749
1991	27533819738.47081
1992	30784208037.889
1993	32927552314.1301
1994	35881114828.86849
1995	37739496052.43719
1996	38349519820.671
1997	40953830843.9575
1998	45488036711.6419
1999	46174327623.9697
2000	50830700200.00309
2001	54508715328.57729
2002	57088123418.0168
2003	59705842122.0479
2004	63086043272.6231
2005	68782091339.76108
2006	75734866169.54939
2007	80556312627.06229
2008	84332574927.50519
2009	90589270230.60281
2010	97493288604.60999
2011	85694098679.76489
2012	91967505726.68047
2013	97900385481.11971
2014	97833511667.34647
2015	69568885990.9593
2016	65617765901.0391