Year	current US$
1970	1009647337.37217
1971	685679149.12892
1972	985729910.94265
1973	1319990911.97745
1974	1931762329.17439
1975	2380661661.49
1976	3247696379.82365
1977	3231792331.92069
1978	3361620753.7379
1979	4418601518.1425
1980	6563904148.92267
1981	17263172174.6086
1982	14663059339.4971
1983	9587872120.68559
1984	6768932979.59634
1985	7323297195.27836
1986	5454493814.46746
1987	4755870548.50999
1988	4354090289.8704
1989	3475274708.95783
1990	4207548110.33427
1991	3931929197.06201
1992	3473571595.21429
1993	2008759999.21014
1994	2527203898.48399
1995	3348497480.93345
1996	3776745371.37119
1997	4084851425.87445
1998	4061706153.03368
1999	4362484300.78853
2000	4713218693.41769
2001	5104167822.76354
2002	6303960997.4762
2003	7089286130.04093
2004	9390171749.61008
2005	11467305034.7111
2006	16828609015.7583
2007	20545099163.9667
2008	24117169381.9113
2009	20606892763.0254
2010	30645895973.3103
2011	34198382166.9784
2012	38774671800.0156
2013	45061902202.6622
2014	51115466417.5361
2015	45612568323.1357
2016	36718420852.7611
2017	33259088171.5772
2018	38573883741.8116
2019	44058802446.4919
2020	46439956482.5339
2021	48951773314.0835