Year	current US$
1970	4099680759.456
1971	4397490966.4
1972	5144059481.64
1973	6101438296.008
1974	8055961344
1975	10293100400
1976	10620286980
1977	10173194727.4336
1978	12867635600.75
1979	16859388542.3509
1980	24451167254.4236
1981	31548698667.5902
1982	25031009514.3022
1983	26405924514.6757
1984	29171690935.5449
1985	30507415532.99
1986	25658465102.2663
1987	26808121191.7593
1988	30215970920.7185
1989	32286039950.4931
1990	34931873975.1598
1991	40677949629.6797
1992	46955380780.2997
1993	60335835550.816
1994	63642223005.454
1995	54451989326.8952
1996	59575165315.6674
1997	67731710004.4618
1998	72082631890.5979
1999	80091252309.2997
2000	92153933253.1754
2001	100889216279.444
2002	105451727077.186
2003	106413888218.568
2004	113868191485.133
2005	126479707817.536
2006	139320823370.286
2007	151216872241.803
2008	164762803059.948
2009	149110049808.727
2010	167232377684.061
2011	184809813488.416
2012	190505378170.031
2013	201004576313.013
2014	204871612446.1
2015	191853625584.95
2016	183476736486.883
2017	199145549265.74
2018	212722144912.881
2019	222029324796.608
2020	214432748187.055
2021	255003995548.117