Year	US Dollars
1990	225507590.64877
1991	245934818.06559
1992	250564582.14591
1993	265249498.40722
1994	294987351.63086
1995	304132750.21425
1996	311133624.95703
1997	316352193.60847
1998	334230633.7279
1999	343420938.8212
2000	356381154.47894
2001	376699611.90596
2002	405467636.99965
2003	418347797.42628
2004	429997049.05926
2005	444902947.37153
2006	463006572.24876
2007	458355638.19253
2008	480084308.5215
2009	499935150.03926
2010	524967770.84405
2011	548648424.3972
2012	564242603.4132
2013	553161290.21271
2014	564695727.99203
2015	593913669.69936
2016	619328811.01379
2017	653695059.26377