Year	current US$
1971	1448815167.21395
1972	1703269450.53073
1973	2294362851.85151
1974	2848823077.81521
1975	3566308379.2425
1976	4273672309.44966
1977	5737115141.69555
1978	7059998929.85084
1979	7953901429.72043
1980	8801554040.53133
1981	7105435533.16568
1982	6370849090.9163
1983	5521688227.68233
1984	5712748468.35105
1985	5675366875.16991
1986	7741928315.52602
1987	8380473924.40277
1988	8530686405.9582
1989	7734536812.55751
1990	8449124034.52527
1991	8416120075.46648
1992	9094939869.92134
1993	8960647429.53485
1994	6980267961.12606
1995	9392575411.7003
1996	10286468279.5099
1997	10125956528.2245
1998	11149694408.3279
1999	10874779903.4171
2000	8874045381.0289
2001	9171707515.28849
2002	10071580849.0111
2003	12218485826.2947
2004	13726981840.8611
2005	15012596776.6958
2006	15403947281.5752
2007	17919385048.6055
2008	21433654179.2312
2009	21911682257.8087
2010	22618513884.7215
2011	22582385043.7393
2012	24422563751.9036
2013	28330452385.3948
2014	46466479800.3275
2015	43312710567.4984
2016	44717062439.0292
2017	47669715730.7049
2018	53492303164.5343
2019	54385585138.2128
2020	57024604628.6985
2021	64141668493.1022