Year	constant 2015 US$
1970	19283351538.123478
1971	20319729651.987995
1972	20230546396.775375
1973	20997728397.85237
1974	24460308050.56381
1975	27863945696.340767
1976	29775934151.346935
1977	31743921560.409996
1978	32227996947.871014
1979	31921626421.959938
1980	33599478826.978672
1981	36171156690.225136
1982	36016607343.70862
1983	33415390229.906433
1984	33844529233.45407
1985	36258701873.82369
1986	36081771142.06168
1987	35561898469.332375
1988	32991719290.20367
1989	32426283068.35835
1990	35142183673.77031
1991	40094810330.69159
1992	42257532523.08384
1993	39719703611.52362
1994	41460472101.87003
1995	41727559105.69924
1996	42147136996.8098
1997	45519267379.3232
1998	46907205511.66746
1999	41149670560.22619
2000	43579493981.85552
2001	42067676511.08104
2002	46271635681.76845
2003	45730788336.47225
2004	43809923303.39675
2005	45305113810.69036
2006	47900373119.83908
2007	50887013606.41688
2008	56942205671.30785
2009	61591330574.77523
2010	61691527297.38429
2011	64572490786.06394
2012	67447695228.52502
2013	72652673025.724
2014	76180514326.52446
2015	78963239412.9177
2016	68704355206.27137
2017	77230016416.98665
2018	74943398506.5901
2019	75535406200.6112
2020	71790790425.58861
2021	73317128561.15887