Year	current US$
1971	957386238.907035
1972	1083301661.05244
1973	1352300794.98102
1974	1482388230.39926
1975	1725848279.93617
1976	2126199768.32913
1977	2734472325.14589
1978	3108632909.35699
1979	3534650949.99312
1980	4194441180.06875
1981	2116888855.42785
1982	1996828345.69451
1983	2598510339.58597
1984	3123495084.30193
1985	3397119007.39854
1986	3889212719.32007
1987	3973379823.74484
1988	4007769158.56816
1989	4544600731.18654
1990	5130328593.63234
1991	6586764262.42832
1992	7874461780.24332
1993	8835121117.92943
1994	9824704831.46365
1995	10811516140.4674
1996	10937763668.5966
1997	11802973072.351
1998	12670499209.7529
1999	12875024105.3536
2000	13443180352.4479
2001	14310909849.1744
2002	14824730375.1606
2003	15445521242.3679
2004	16692898661.6637
2005	17981209227.6955
2006	20647101396.297
2007	24613082797.578
2008	28464869693.5109
2009	27922106706.908
2010	34286836984.129
2011	38850896564.5379
2012	43145964404.4035
2013	46374158062.8537
2014	47166941923.3311
2015	51139413619.9991
2016	53343372587.4921
2017	54100520235.9829
2018	55659376522.3664
2019	57459966626.1984
2020	55281082435.661
2021	56532369847.645