Year	US Dollars adjusted for inflation)
1977	177953659.29596
1978	185748644.36988
1979	199632065.30143
1980	216161690.23844
1981	218597309.40014
1982	219634075.5879
1983	222370454.46349
1984	241543631.20389
1985	262350646.02098
1986	290116753.42812
1987	308537316.82943
1988	337876220.8627
1989	356952408.61384
1990	374410304.2727
1991	366366624.25154
1992	382037139.73587
1993	408800265.92922
1994	430520454.31795
1995	455287533.23912
1996	482086484.56186
1997	515332775.88595
1998	511893889.88869
1999	529239413.78632
2000	585837977.04214
2001	617846873.29322
2002	633800725.56403
2003	610887576.68761
2004	632920316.88863
2005	688436496.08122
2006	700911189.68653
2007	699673794.61352
2008	743696676.57012
2009	721236727.82151
2010	705015370.37037
2011	721926789.99504
2012	717591255.68514
2013	762224674.55651
2014	807676562.98434
2015	839792649.00185
2016	858344680.01923
2017	873306445.50626