Year	current US$
1970	32225555.327573
1971	33914138.8657867
1972	41145473.7522416
1973	52554892.4046698
1974	61359260.9295227
1975	78410201.120269
1976	111522315.943633
1977	195139011.843112
1978	254576792.40421
1979	389226922.356439
1980	460990169.150929
1981	609043985.26842
1982	540157496.939065
1983	497528606.408728
1984	454875556.418377
1985	345317044.550607
1986	403748059.297367
1987	473336347.127883
1988	457193904.08097
1989	464770619.162114
1990	609375863.792504
1991	574236325.857599
1992	567914524.313538
1993	560621093.531048
1994	607657354.021136
1995	699312156.161838
1996	813838378.828094
1997	892552176.444037
1998	862479147.214676
1999	909390955.758893
2000	980552096.063282
2001	902666569.78876
2002	549752540.183329
2003	576342113.858834
2004	730694640.152716
2005	876306336.685463
2006	1104799870.33169
2007	1494050761.07798
2008	2162045681.53862
2009	2043152458.13151
2010	2379993293.8387
2011	3002156818.8794
2012	3181380715.44174
2013	3133849396.95315
2014	2898618001.99982
2015	2420187763.58458
2016	2207571301.50442
2017	2217954824.08878
2018	2379608163.93687
2019	2447766093.23061
2020	2326687256.88915
2021	2637906638.34756