Year	US Dollars adjusted for inflation)
1990	7693306832.4784
1991	7218570743.08383
1992	6744657232.91406
1993	6240880484.35722
1994	6131155435.15501
1995	6062809746.02776
1996	6134660341.64662
1997	6222998305.92263
1998	6433256966.43762
1999	6712397782.5365
2000	7017753871.63858
2001	6802502120.44073
2002	6904133452.9802
2003	7057558640.8242
2004	7387459163.25549
2005	7736396749.21033
2006	8133817396.81345
2007	8660358997.01112
2008	9134228879.94995
2009	9101472088.16896
2010	9407168702.4313
2011	9627286317.03306
2012	9583368137.54723
2013	9863707082.21495
2014	10221724268.9544
2015	10614404462.0042
2016	10924716121.9693
2017	10926923317.7401