Year	US Dollars
1990	1185858196661.5603
1991	1162628352151.00977
1992	1009161843778.37
1993	943162724013.77979
1994	846916330048.0509
1995	825535430160.17297
1996	805913722270.61401
1997	824634523073.31384
1998	771248318859.01416
1999	836377678625.74512
2000	974629947987.71484
2001	1060628740394.33984
2002	1144425580988.59009
2003	1297547987709.56006
2004	1442160250554.04004
2005	1655585941892.40015
2006	2071669066191.67017
2007	2324769766658.25
2008	2797649362807.68066
2009	2678149677195.79004
2010	2837671791921.18945
2011	3373184617515.05957
2012	3579360949689.45898
2013	3635166063636.95068
2014	3644656165133.84961
2015	3521836492512.38916
2016	3539663675494.7002
2017	3721575460626.83057