Year	US Dollars
1990	76033348726.77589
1991	80700474125.56729
1992	86429915550.96498
1993	90860072179.5114
1994	98070861757.76152
1995	104757973390.75
1996	116047657844.85699
1997	124657190931.64301
1998	123424602990.243
1999	135214378603.276
2000	163744425122.04001
2001	170851876004.23401
2002	172786645952.78897
2003	176961583090.935
2004	195531186977.73694
2005	223283781244.71103
2006	252259533805.73004
2007	262236633022.18796
2008	292751409510.54596
2009	268961998995.78204
2010	286311257758.08203
2011	310285248850.12604
2012	330815080305.20892
2013	344244308199.84894
2014	349842613934.34094
2015	333636448629.81702
2016	322635672802.17499
2017	337954041895.73499