Year	US Dollars
1995	13787194794.1321
1996	14331175105.2447
1997	15886006887.3925
1998	17152226925.7213
1999	17533987008.329
2000	18959591512.6508
2001	21198203339.607
2002	23303214678.2713
2003	25103645177.4653
2004	27079517162.53981
2005	30679963022.049
2006	34070614198.6144
2007	38692930790.1302
2008	41769546735.0529
2009	38682583916.23809
2010	37329556167.6478
2011	40716293117.59069
2012	42941344149.98579
2013	45633888376.78009
2014	47426201562.71071
2015	48261129004.77511
2016	50018389103.8328
2017	53173769019.61549