Year	US Dollars
1992	73948317357.7594
1993	93084464568.53139
1994	100211462217.133
1995	112224615785.438
1996	113492091221.56999
1997	122597665699.179
1998	130515417905.26001
1999	124153132836.382
2000	133840068635.90001
2001	133536971401.37102
2002	133126442714.02902
2003	156820224628.18698
2004	181317779004.10202
2005	206311597103.41403
2006	232650743842.13297
2007	253188698631.47601
2008	256141861928.94104
2009	243335477724.40405
2010	237103277874.55301
2011	261909682318.45105
2012	287989538163.95605
2013	296876201937.00995
2014	309381592252.38898
2015	318782586331.53107
2016	336959727711.35895
2017	344617274121.90894