Year	US Dollars
1990	4701178301.35462
1991	5066369987.77732
1992	5469964525.25817
1993	5931218912.96374
1994	6543982838.42589
1995	7134225593.71183
1996	7765166836.86417
1997	8266727401.01384
1998	8646892961.3935
1999	9549013843.15677
2000	10067904744.5246
2001	10910940928.8397
2002	11763951504.1914
2003	12469392381.3084
2004	13843946787.1914
2005	15575688062.0893
2006	16881477422.6895
2007	19046627781.2103
2008	20679710547.9855
2009	22837928374.6439
2010	24181657065.2076
2011	26541063220.8385
2012	29451879352.0942
2013	32532123298.96989
2014	36001507021.4078
2015	39023012654.55801
2016	42361978920.161
2017	45625252999.11239