Year	US Dollars adjusted for inflation)
1987	9505676773.02965
1988	10553546665.6782
1989	10104459535.7441
1990	13679877891.7139
1991	13049883507.5037
1992	11096839691.0073
1993	11263292305.6718
1994	9314758452.22201
1995	8644092030.71642
1996	9223245519.13358
1997	8171795508.9546
1998	8751993018.19031
1999	10196071822.1891
2000	10753701529.1433
2001	11220825732.1485
2002	11249683443.3515
2003	11617416308.6071
2004	12198334457.7675
2005	13789041600.9069
2006	15301298963.195
2007	16993515438.4036
2008	19491562207.84889
2009	20680547524.915
2010	22583157894.7368
2011	25902882088.97449
2012	28778101990.8921
2013	31713468423.1438
2014	34979955661.3867
2015	37253652747.7258
2016	39563379205.5788
2017	42134998872.46889