Year	US Dollars
1990	56512778248.616
1991	63129269543.8909
1992	73635454930.5349
1993	82071264627.85359
1994	88550012807.1631
1995	101311558288.90701
1996	112664313645.711
1997	123278026286.22098
1998	131110453069.18898
1999	131746830543.95001
2000	140960454358.75803
2001	149253118441.34897
2002	155333425415.21396
2003	161054271284.28601
2004	173398538270.48499
2005	188317825120.02203
2006	226078144112.06
2007	248532258314.11896
2008	254385225595.47894
2009	254280872639.71802
2010	288343692090.01495
2011	329127077663.85809
2012	356256734034.51288
2013	377043798635.39203
2014	391232027580.04492
2015	391766193792.27393
2016	403764459869.48401
2017	427437139376.88599