Year	US Dollars
1990	358935749593.17395
1991	339014597626.76196
1992	306473995200.54901
1993	262874802481.66696
1994	210642749586.96198
1995	186977559781.22101
1996	171917083949.36804
1997	169613935594.23801
1998	166948972102.53503
1999	167895904389.81503
2000	181358498559.31699
2001	205184981140.48898
2002	219894030534.68103
2003	246034544423.67487
2004	283181681705.539
2005	300451674179.00604
2006	330760976142.85205
2007	366816480313.15997
2008	385052270269.63397
2009	326468959758.78802
2010	346460694538.698
2011	369725094277.30798
2012	379899349167.87994
2013	385925704140.40198
2014	369061907704.53711
2015	336424870296.89203
2016	349342229970.383
2017	378110570162.40393