Year	current US$
1977	25125418659.719406
1978	35542596540.0767
1979	39518769479.87596
1980	42371941848.041985
1981	39962750134.45305
1982	39525144420.26131
1983	38681451732.65674
1984	39226467429.94805
1985	40146590009.379654
1986	56266270183.07486
1987	69399910244.30518
1988	78835076248.73642
1989	76023852526.04813
1990	96031540401.00931
1991	91864059323.14415
1992	90063160837.26923
1993	88775979540.46404
1994	97887895326.3456
1995	115719786098.28276
1996	109186488431.97401
1997	98432160560.47699
1998	103896004196.32147
1999	102311051478.87038
2000	104860304495.01382
2001	98661971739.22302
2002	100762001178.86426
2003	131765897261.79085
2004	147904074598.85193
2005	161839842947.78534
2006	179273830439.09915
2007	175500846358.2652
2008	163093221538.00308
2009	191755289693.75803
2010	235674303753.1623
2011	252499662459.70032
2012	248696775828.4934
2013	251162883205.79843
2014	242814402092.5092
2015	241773864005.18787
2016	231498923246.46826
2017	221226351498.29266
2018	227738003361.95673
2019	224308018458.91675
2020	225397083973.5513
2021	286728213350.88794
2022	284661060339.4097
2023	285290402435.77313