Year	US Dollars adjusted for inflation)
1977	265671187.62375
1978	279861789.81174
1979	295539865.74531
1980	293959345.33286
1981	298469234.33081
1982	310778905.94976
1983	322068184.95097
1984	333561090.79288
1985	353507035.84154
1986	378939326.0833
1987	413413034.03562
1988	425678153.30084
1989	441716548.9616
1990	459440912.44899
1991	465806684.1489
1992	461841976.34958
1993	452795343.75522
1994	460463686.6672
1995	470269146.44771
1996	491140794.96414
1997	515773935.05997
1998	576341238.00692
1999	616157286.4477
2000	646274759.69485
2001	633194804.57022
2002	654959758.57555
2003	716944976.10934
2004	712303113.59537
2005	806847560.79538
2006	774632718.7704
2007	822062784.99506
2008	829864579.65785
2009	774978091.9015
2010	771015888.88889
2011	776912813.79164
2012	767937177.52872
2013	786001370.76679
2014	843718595.99926
2015	898036907.79378
2016	931118693.4541
2017	965852407.11293