Year	US Dollars adjusted for inflation)
1980	4412911486.63827
1981	4455780709.35782
1982	4438042654.6378
1983	4357117141.46027
1984	4346795502.2369
1985	4366972080.70998
1986	4575157421.37656
1987	4737747944.82168
1988	4776272888.48722
1989	4865048284.84063
1990	4964658201.39698
1991	5370052951.12391
1992	5756124453.39372
1993	5665204214.98162
1994	5763205418.04008
1995	5987913615.09621
1996	6179007353.17203
1997	6439767658.78691
1998	6651738120.90913
1999	6875853709.52881
2000	7115971119.14836
2001	7199793619.68864
2002	7544567351.04374
2003	7864441488.71893
2004	8829372914.44225
2005	9052690941.65474
2006	9693003646.96915
2007	10334398853.639
2008	10608240991.1714
2009	10639638311.1204
2010	11282192605.0374
2011	11856607186.6558
2012	12456750940.0066
2013	13156162589.0949
2014	13991799668.839
2015	14846241337.3127
2016	14950179756.803
2017	14835013233.6474