Year	current US$
1970	161746518.132586
1971	160160362.71361
1972	193624709.631503
1973	310784671.092423
1974	356577003.032399
1975	391338154.129272
1976	412948539.876338
1977	420811536.325735
1978	457827683.563717
1979	619152122.482419
1980	717478864.336439
1981	508773893.785114
1982	514430023.904785
1983	469393551.132977
1984	395083688.577396
1985	420559657.51806
1986	524718845.481578
1987	560774910.997821
1988	799788976.594514
1989	879118681.700041
1990	872160608.122912
1991	723578969.605766
1992	766318040.153305
1993	701756340.749045
1994	743081663.119672
1995	871368582.571471
1996	894175505.206813
1997	730982096.395023
1998	631525047.152577
1999	578312540.650211
2000	725048688.216769
2001	107198210.204418
2002	0
2003	0
2004	0
2005	0
2006	0
2007	0
2008	0
2009	0
2010	0
2011	0
2012	0
2013	0
2014	0
2015	0
2016	0
2017	0
2018	0
2019	0
2020	615241733.383555
2021	748244629.307878