Year	current US$
1979	4654003.897728264
1980	4788263.632636326
1981	4173025.0723020523
1982	4415433.228005987
1983	3733521.1834557713
1984	4706238.032852967
1985	5196544.439414516
1986	5033807.762710598
1987	6663692.887509217
1988	7919483.653496255
1989	7807517.967632409
1990	8218007.859217495
1991	9563037.249283668
1992	9101171.158459151
1993	8224969.361989127
1994	10188565.783256732
1995	10837473.575295912
1996	11528925.249957483
1997	11115905.756451195
1998	11559197.757170584
1999	11969785.008715864
2000	12278110.121032886
2001	11595698.924731182
2002	11041798.898554338
2003	12906217.782792479
2004	14724036.13918955
2005	15002860.566773288
2006	15871174.794933079
2007	16058572.30018304
2008	15108428.334936626
2009	17444120.93917236
2010	33455158.473277867
2011	33374626.143551778
2012	28109566.860072862
2013	25893116.852209322
2014	27000669.51564765
2015	20717655.36110575
2016	19589767.22747177
2017	25551648.260777213
2018	25398266.237008125