Year	US Dollars
1990	165671586049.52298
1991	166528012830.86398
1992	174039523597.40802
1993	176257747408.15103
1994	177327341582.34805
1995	185620905887.98001
1996	196323147645.75204
1997	203685455901.505
1998	217434488262.80997
1999	226501021766.07297
2000	239902565103.63199
2001	258154158879.52002
2002	274117971410.27701
2003	300483017115.11304
2004	320350572615.79004
2005	347228355991.42401
2006	367501778915.349
2007	400289847077.79999
2008	420933998104.88
2009	430024503508.27399
2010	454357976236.16998
2011	473230115543.80499
2012	494193563909.62689
2013	514565513444.54901
2014	543490115942.32202
2015	567077681257.34399
2016	603612916193.91089
2017	621886410216.63892