Year	constant 2015 US$
1970	15112973542.170694
1971	16597953361.57343
1972	18840109158.05429
1973	20635033622.478897
1974	19199814346.707806
1975	17029598256.542181
1976	17169283710.446089
1977	19229788946.96093
1978	20424877457.326942
1979	20150273016.897255
1980	21870218819.199207
1981	23073832826.616783
1982	23594711405.32694
1983	21911962022.68319
1984	18102295290.430458
1985	17460211304.522644
1986	19358269430.182407
1987	22842226448.750374
1988	26230328210.645683
1989	27189648560.292557
1990	29258013586.124588
1991	30231811969.481228
1992	31599454143.623024
1993	29847893881.015606
1994	30660483369.903103
1995	32669002379.92771
1996	34363591374.62732
1997	39230253314.34021
1998	43833702182.47145
1999	46494180952.643326
2000	48380633573.46715
2001	48851136938.40426
2002	47194159321.183945
2003	43742433652.08864
2004	43825035777.282776
2005	43873316230.71833
2006	43541294498.1988
2007	44885062173.96013
2008	45075131717.74021
2009	41677259585.330055
2010	41208161973.22537
2011	36019121077.525375
2012	29999430042.104282
2013	28557806657.9285
2014	29211350802.483578
2015	30940414581.720688
2016	31728540420.882797
2017	35373828380.337875
2018	37560835838.59022
2019	39584517451.77811
2020	38722643400.28905
2021	41845657013.81756
2022	43099697272.60116
2023	44198495597.24139