Year	US Dollars adjusted for inflation)
1975	3430655903.04526
1976	4264633675.27213
1977	4542259036.00119
1978	5496320493.27908
1979	5997588667.43007
1980	7137835212.14138
1981	7473849880.33639
1982	8025795531.67538
1983	8185540587.43282
1984	8892824005.09344
1985	9200194732.25608
1986	9845510930.047
1987	10130598302.3181
1988	9942968817.99862
1989	8605429249.81579
1990	8689225175.64879
1991	8847707641.16376
1992	10499117722.4966
1993	10985322938.3554
1994	11533099474.9009
1995	12246576491.8143
1996	12502205101.138
1997	12915764669.3606
1998	13302454697.6357
1999	13755998495.5242
2000	14339974666.67
2001	15095492948.243
2002	15968688821.7032
2003	16633153996.0935
2004	18058165848.0319
2005	19529289369.2661
2006	21109859431.3895
2007	22835742224.5032
2008	24487316381.7007
2009	25828384110.2509
2010	26425379436.6197
2011	27108947011.2349
2012	27827651432.2689
2013	28614830798.3148
2014	29500840467.5286
2015	30206410880.23439
2016	30811666897.11239
2017	31418664052.9154