Year	current US$
1977	32592592.5925926
1978	39703703.7037037
1979	56888888.8888889
1980	66370370.3703704
1981	78703703.7037037
1982	79000000
1983	71777777.7777778
1984	71148148.1481481
1985	88111111.1111111
1986	105807407.407407
1987	115092592.592593
1988	119888888.888889
1989	128629629.62963
1990	138800000
1991	149118518.518519
1992	138625925.925926
1993	159318518.518519
1994	161914814.814815
1995	169207407.407407
1996	194092592.592593
1997	212592592.592593
1998	253185185.185185
1999	266296296.296296
2000	310138518.518519
2001	280206740.740741
2002	272108074.074074
2003	311462481.481481
2004	319120962.962963
2005	396159888.888889
2006	402395592.592593
2007	436385259.259259
2008	451733185.185185
2009	360979629.62963
2010	379569185.185185
2011	395495481.481481
2012	395684296.296296
2013	424283148.148148
2014	536930185.185185
2015	565461000
2016	553047296.296296