Year	US Dollars
1990	9318527501.84879
1991	9902453412.85115
1992	10593876570.1626
1993	12009328998.0346
1994	12144344448.152
1995	12719906167.5902
1996	13461824558.2232
1997	14659906941.4727
1998	15334870664.4644
1999	15430712681.5121
2000	16679379234.4171
2001	17473728520.0887
2002	18328034947.8219
2003	19410025988.99929
2004	21036450582.9665
2005	23136000907.7895
2006	25361283627.7036
2007	28124419119.8078
2008	29722539870.6791
2009	29043320119.2168
2010	30410386065.6866
2011	31919842265.4422
2012	33369896848.2355
2013	34673169032.0137
2014	36052356264.6249
2015	38394917938.3158
2016	40270829541.48921
2017	42887063971.6332