Year	US Dollars
1990	4525799977.77102
1991	4822457220.86986
1992	4630471651.17823
1993	4800099845.34729
1994	5073961917.48201
1995	5275458405.54061
1996	5627902607.5258
1997	5873887170.55715
1998	6584779237.37562
1999	6658245443.40324
2000	6717925577.39644
2001	7369765815.60476
2002	7680585638.62636
2003	8262005534.78475
2004	8543636109.6968
2005	9228632374.35712
2006	10095435088.3114
2007	10685568153.1418
2008	11898943086.6254
2009	11869218537.6254
2010	13002613862.5323
2011	13573029438.3778
2012	15278057189.8479
2013	16266131542.4203
2014	17907922587.2028
2015	18836106700.5082
2016	20008805774.6777
2017	21355577452.2802