Year	current US$
1970	694026743.963936
1971	343278020.412158
1972	398925483.310106
1973	687533006.064042
1974	1059049332.61548
1975	1294967741.5973
1976	4457468407.0951
1977	4145943801.82313
1978	5068171400.85911
1979	6015382720.91285
1980	6281310246.69891
1981	6590449586.70924
1982	6571901720.64956
1983	5966049508.62585
1984	5694371106.05076
1985	5768596922.55795
1986	6905138182.97163
1987	5491690958.41295
1988	4304091298.9598
1989	4576170236.93956
1990	4366623178.56751
1993	2422962924.58594
1994	2860620122.00103
1995	3453422371.00127
1996	3835326801.02867
1997	3182818546.53526
1998	4578949996.56912
1999	4701809816.86767
2000	4402561063.41552
2001	5087071140.89776
2002	5830285613.88763
2003	6784013095.49508
2004	8613974478.53822
2005	10194508693.9944
2006	12707786964.1059
2007	15717439220.523
2008	15968514081.1034
2009	16817495398.0726
2010	20011042251.4506
2011	22967632964.4234
2012	20879309783.4203
2013	15671028384.4052
2014	13234722827.3332
2015	10940067505.146
2016	14780360544.1977
2017	17660163362.6104
2018	12479323251.1438
2019	9785261467.83786
2020	8000012360.41997
2021	12009983020.6041