Year	current US$
1975	4177487.373
1976	3934568.167
1977	4062921.047
1978	4317711.83
1979	4569461.346
1987	48816528.32
1988	99664604.19
1989	138804718
1990	185221130.4
1991	130178665.20000002
1992	153098281.9
1993	175595687.9
1994	119271873.5
1995	115796006.036033
1996	164153195.075007
1997	194441070.788517
1998	189584328.714763
1999	322894736.842105
2000	342368421.052632
2001	367105263.157895
2002	435000000
2003	571052631.578947
2004	801868421.052632
2005	1116972560.32095
2006	1365476253.08673
2007	1556236305.16812
2008	1329070849.75759
2009	1130872358.13318
2010	1102925378.35443
2011	1211496095.71246
2012	1293805738.45028
2013	1423370251.95251
2014	1579517557.43041
2015	1643720838.27636
2016	1603918551.47574
2017	1648944928.4616
2018	1685578502.03885
2019	1597353741.92284
2020	1426684074.92525
2021	1552334622.98838
2022	1619576050.45209
2023	1750000000