Year	current US$
1970	1803101400
1971	2189960200
1972	2576582476.3903465
1973	3163574427.020507
1974	3613191829.268293
1975	4125111463.414634
1976	4366677953.714982
1977	4500076265.060241
1978	5654444935.064935
1979	6207347671.232877
1980	6292183472.222222
1981	6382548795.180723
1982	6648362235.294118
1983	7047198370.197905
1984	7629374615.822425
1985	7131660115.733158
1986	7766061315.094792
1987	8068648861.757599
1988	8725618073.878628
1989	8576307061.386646
1990	8880540292.553192
1991	8100081070.015013
1992	7685581081.081081
1993	7914077027.027027
1994	7756708243.243243
1995	7422978935.273842
1996	6643000000
1997	6806900000
1998	7122047400
1999	8204404100
2000	9046224800
2001	9786000000
2002	11455875900
2003	12110612500
2004	13554299600
2005	14348951700
2006	15741791944.444443
2007	19214351851.851852
2008	22453703703.7037
2009	22395370370.37037
2010	20703703703.7037
2011	24437000000
2012	23343000000
2013	25032000000
2014	26138000000
2015	28062000000
2016	29143000000
2017	29867000000
2018	30060000000
2019	33337000000
2020	41704000000