Year	current US$
1970	353592628.080633
1971	375587860.239735
1972	406169596.690796
1973	442387919.189237
1974	437275711.614378
1975	546633932.485752
1976	570855213.505461
1977	600959129.977196
1978	580097786.537294
1979	661111285.714285
1980	747776880.304168
1981	675545675.675676
1982	1164203196.42857
1983	1454400459.83702
1984	1410212301.60547
1985	1580868764.57491
1986	1654730455.71469
1987	1520695057.28264
1988	1356096758.43271
1989	1530620118.80421
1990	1379276658.59645
1991	1279455240.67797
1992	1514494314.80757
1993	1591241869.38775
1994	1980316168.92052
1995	2479919647.47862
1996	2926860230.18868
1997	3473697839.52802
1998	3779664481.41699
1999	4023912795.74222
2000	4424603527.84217
2001	4312145945.89834
2002	3760125835.49334
2003	3536896154.12603
2004	3466075797.02116
2005	3941202459.40024
2006	4762109466.3766
2007	5805695387.68151
2008	7242092574.41957
2009	8350287467.72377
2010	9467112154.40322
2011	10142949834.9003
2012	12026372265.0736
2013	12396485193.9337
2014	13159830495.2525
2015	14277299528.5941
2016	14467169415.1215
2017	10196987123.7031
2018	10738153001.527
2019	12883630367.2864
2020	15610914004.6162
2021	17280300730.2836