Year	US Dollars
1990	5922924000000.00098
1991	6117250000000
1992	6459473000000
1993	6758382000000
1994	7195801000000
1995	7602259000000.00098
1996	8075414000000
1997	8620324999999.99805
1998	9167551000000.00195
1999	9725260000000
2000	10421259000000
2001	10788611999999.99805
2002	11098891000000
2003	11591408000000
2004	12372644999999.99805
2005	13221776000000
2006	14140770000000
2007	14585723000000.00195
2008	14791193999999.99805
2009	14494460000000
2010	15121133000000.00195
2011	15802898000000
2012	16596083999999.99609
2013	17073715999999.99609
2014	17892074000000
2015	18581144000000
2016	18968714000000
2017	19607598000000.00391