Year	US Dollars
1990	44856898639.31361
1991	47438512020.5742
1992	49505318943.57262
1993	52277933450.08762
1994	56723052603.6366
1995	62420458384.0758
1996	68392294411.27139
1997	75094529901.63138
1998	83377214656.63199
1999	88480224908.68622
2000	100076463397.06401
2001	107539141218.83197
2002	116063239398.89799
2003	124844043883.405
2004	135884436523.14204
2005	145694648944.80301
2006	165761502204.52802
2007	177912914596.552
2008	172080530193.85901
2009	157342200206.15601
2010	164857539679.26703
2011	169257301329.02301
2012	174456547300.84402
2013	188840590314.92996
2014	202512801068.56699
2015	255007229117.29196
2016	280560276394.26001
2017	297992251216.97205