Year	US Dollars adjusted for inflation)
1990	124277669352.06601
1991	108223218113.20399
1992	98735041342.8074
1993	100244536715.129
1994	104186094488.34599
1995	111623119759.08
1996	115942715344.63098
1997	110358743832.94197
1998	108055284067.056
1999	107621412361.36499
2000	110199046925.19101
2001	116361380210.89697
2002	122393777829.04599
2003	129155150175.37997
2004	139950701289.41998
2005	145789324626.98203
2006	157533471358.05698
2007	168346186627.487
2008	182251360747.26401
2009	171479648737.93201
2010	166658327826.552
2011	170041121878.45096
2012	172146541418.69699
2013	178226065182.785
2014	183708858515.33301
2015	191009095003.25198
2016	200217212681.66501
2017	214126451996.14001