Year	current US$
1977	14851851.8518519
1978	15629629.6296296
1979	16592592.5925926
1980	23407407.4074074
1981	25851851.8518519
1982	34518518.5185185
1983	34592592.5925926
1984	35851851.8518519
1985	43348148.1481481
1986	46237037.037037
1987	48481481.4814815
1988	49814814.8148148
1989	61388888.8888889
1990	63240740.7407407
1991	69074074.0740741
1992	70881481.4814815
1993	72355555.5555556
1994	80418518.5185185
1995	96177777.7777778
1996	96751851.8518519
1997	105214814.814815
1998	144748148.148148
1999	151362962.962963
2000	159300000
2001	181307407.407407
2002	182274074.074074
2003	169618518.518519
2004	178477777.777778
2005	161796296.296296
2006	153492592.592593
2007	149185185.185185
2008	156937037.037037
2009	178837037.037037
2010	191785185.185185
2011	201122222.222222
2012	217237037.037037
2013	216900000
2014	226774074.074074
2015	224796296.296296
2016	206037037.037037