Year	US Dollars adjusted for inflation)
1977	184943154.5658
1978	206715583.20938
1979	168588642.74888
1980	192630537.54858
1981	215908721.78022
1982	224835299.68666
1983	230887181.87199
1984	243416029.25657
1985	246542855.72556
1986	263992511.37962
1987	283841295.70625
1988	308135321.25382
1989	307386040.6023
1990	323538864.35951
1991	325505757.07959
1992	332170021.76848
1993	337753613.88323
1994	342587966.69292
1995	349353116.75814
1996	358582268.10061
1997	363928076.69109
1998	382044733.52991
1999	384655225.33517
2000	386098878.53174
2001	387925524.04015
2002	381124567.93563
2003	410422425.45583
2004	423761746.26116
2005	423387808.82532
2006	435791748.537
2007	463338169.7699
2008	496331284.9696
2009	490525414.25522
2010	493824407.40741
2011	492683617.07212
2012	487394618.52553
2013	484433053.87997
2014	505882235.85466
2015	493013933.98665
2016	506021862.86935
2017	484700482.82015