Year	US Dollars
1993	25180938033.29629
1994	20643240295.0303
1995	18518597566.8751
1996	18811241904.40689
1997	20597909130.6074
1998	22889919358.4893
1999	24789182509.7295
2000	26907747949.7874
2001	30092243506.55149
2002	33692112299.78991
2003	38251241287.3622
2004	42391746219.1933
2005	52683901098.0616
2006	72749323539.6284
2007	90616142318.72897
2008	108505359467.783
2009	123477286948.70303
2010	133024671566.994
2011	134628001917.261
2012	141899205791.89099
2013	153660985190.03598
2014	163084258618.353
2015	165029081726.43503
2016	157304710752.58499
2017	164179157033.49899