Year	constant 2015 US$
1976	10239361250.911583
1977	10505142877.823397
1978	10113691528.311548
1979	9871228929.92647
1980	9831372340.415182
1981	10265030594.119034
1982	9338213650.23548
1983	9243204281.00396
1984	9142379046.021235
1985	9569293994.10262
1986	9206855838.704195
1987	9624264858.84954
1988	9697958612.04088
1989	9941015189.797464
1990	10466395420.99287
1991	10994887847.050913
1992	11189243614.649805
1993	11489910081.10672
1994	11985004704.426418
1995	12650486332.468527
1996	13428431559.06358
1997	14206736273.724434
1998	15071989643.562325
1999	14757967223.546194
2000	14590802659.328787
2001	15058438375.995792
2002	15556270349.298716
2003	15986993849.043556
2004	16560503246.861696
2005	16900329871.01395
2006	18055443043.606598
2007	18849709142.294056
2008	20980090554.348377
2009	21436753421.400578
2010	22811930993.745956
2011	23883281716.568687
2012	24436300498.420433
2013	25794864343.969257
2014	26603654767.536285
2015	27893798723.5079
2016	29396899471.48019
2017	30670824225.931118
2018	32002506714.92685
2019	32901383516.795635
2020	30256551370.2949
2021	29995922716.339973