Year	US Dollars
1995	20765112417.8678
1996	22669824337.8371
1997	23185598416.8449
1998	23442521589.73071
1999	23355722818.44409
2000	22108562039.4294
2001	22824721974.8737
2002	23842398803.9334
2003	23135906905.4052
2004	25175064371.9877
2005	26611256692.6956
2006	29882284389.5122
2007	34259633851.40429
2008	37602327693.29471
2009	35823023438.5142
2010	41224718927.3903
2011	44824601376.0354
2012	44301173452.0354
2013	51859027931.30291
2014	55762924729.464
2015	57721021033.82889
2016	60890290491.9301
2017	62521568722.19648