Year	current US$
1976	31669029.24
1977	50965206.15
1978	68538520.81
1979	76457801.82
1980	94037223.82
1981	83050415.04
1982	79724700.93
1983	78231697.08
1984	73591163.64
1985	71504096.98
1986	57127079.01
1987	63812549.59
1988	71362930.3
1989	68941131.59
1990	78588905.33
1991	65672111.50999999
1992	81192558.29
1993	79412124.63
1994	81269264.22
1995	48627363.7227341
1996	49323279.2474983
1997	47674892.2612299
1998	48278804.301384
1999	49728542.0190064
2000	44986487.5854566
2001	77850333.4881202
2002	20660797.8343269
2003	31813793.7384458
2004	77391644.2646359
2005	104817181.330673
2006	104511095.044778
2007	142176008.195292
2008	948622574.642726
2009	593413153.622354
2010	861734943.563197
2011	740510457.837586
2012	601116874.592812
2013	430999362.555457
2014	323088099.019211
2015	297848196.400832
2016	391574035.845098
2017	464457798.805869
2018	521192046.616381
2019	535460673.914564
2020	567643092.516312
2021	627107878.865523
2022	522487299.712997
2023	600000000