Year	constant 2021 US$
1970	20302969837.188736
1971	21172679600.00038
1972	19274530018.776672
1973	25571179934.72517
1974	31675259723.42491
1975	40002559592.247025
1976	39462889456.987404
1977	34458280591.84552
1978	34367410369.63465
1979	37810480442.523964
1980	40879560088.15768
1981	37262589781.76118
1982	35967730072.0215
1983	34567429837.49323
1984	34863069364.547745
1985	36027439722.061165
1986	34743570079.8035
1987	31397960556.983967
1988	29695730043.41127
1989	29752069887.638107
1990	39982049756.05013
1991	41444389415.681366
1992	35023300234.19859
1993	29945950119.01857
1994	31495549838.54296
1995	24855580013.751984
1996	27407349977.493298
1997	22417569849.491127
1998	24677570093.15492
1999	23982949793.81564
2000	23000030174.25538
2001	28491039951.32447
2002	27290130030.632027
2003	25534240024.56666
2004	24177049916.267395
2005	26948209917.06851
2006	25795290069.580086
2007	25380470056.533813
2008	29988630001.068123
2009	33103470127.10574
2010	35220259978.29438
2011	35905539763.45065
2012	34477539922.71427
2013	45691910055.16057
2014	43576750046.730064
2015	47572319744.110146
2016	52838970551.729225
2017	54212169319.09327
2018	57837230150.2228
2019	54560659460.067764
2020	63352999917.984055
2021	62844090360.64152