Year	US Dollars
1990	4434911643.77242
1991	4992385863.32685
1992	4729056950.83267
1993	5318872263.63848
1994	4794320093.39876
1995	5728765062.27663
1996	6369117509.73346
1997	6734883979.51068
1998	7014252879.60755
1999	7339581933.35528
2000	7645611652.67199
2001	7442500752.93154
2002	7737067319.32817
2003	8339603815.48633
2004	9031003964.77123
2005	9648705884.44562
2006	10427678502.096
2007	11788948585.9383
2008	12945263784.1925
2009	14054556258.5426
2010	15110821295.6223
2011	16190322193.7146
2012	16661659105.7795
2013	17686796275.3501
2014	19055104050.5455
2015	19725068804.3231
2016	20600213314.2317
2017	21881672214.1951