Year	current US$
1977	64381390.591428176
1978	69055040.37528831
1979	87142175.7311692
1980	144431071.6954817
1981	121941015.3795251
1982	153727219.3430765
1983	123415524.9932477
1984	115034337.4699096
1985	271008355.77332807
1986	139170515.0947823
1987	151821281.40821108
1988	181442575.8191821
1989	225879622.6841613
1990	253123421.4666483
1991	258981901.61167032
1992	276357290.34876764
1993	344530359.0930166
1994	353097490.94145507
2009	221526674.913595
2010	263126873.37314498
2011	316111851.043883
2012	313179217.17211896
2013	324956646.01755697
2014	332981956.884259
2015	340688113.64665
2016	348628485.873019
2017	428969318
2018	451680131.505
2019	554189208.94
2020	313279564.9521