Year	current US$
1977	47548148.1481481
1978	65655555.5555556
1979	78729629.6296296
1980	89329629.6296296
1981	78811111.1111111
1982	82970370.3703704
1983	98274074.0740741
1984	103751851.851852
1985	116148148.148148
1986	166481481.481481
1987	180148148.148148
1988	239444444.444444
1989	252470370.37037
1990	284977777.777778
1991	294714814.814815
1992	329514814.814815
1993	336714814.814815
1994	340059259.259259
1995	384718518.518519
1996	353085185.185185
1997	358644444.444444
1998	384185185.185185
1999	382000000
2000	374977777.777778
2001	327044444.444444
2002	318581481.481481
2003	388818518.518519
2004	428903703.703704
2005	524918518.518519
2006	440207407.407407
2007	457125925.925926
2008	536059259.259259
2009	543951851.851852
2010	608870370.37037
2011	572844444.444444
2012	603759259.259259
2013	607777777.777778
2014	627788888.888889
2015	627200000
2016	612703703.703704