Year	constant 2015 US$
1970	337.4519530821942
1971	331.28077727921004
1972	322.6005852279001
1973	321.6289772899814
1974	316.75277490467846
1975	301.960874826289
1976	350.61197869583646
1977	347.5859680140912
1978	368.7683678762833
1979	400.90202179789486
1980	423.6180371778272
1981	432.2529860988915
1982	424.0685592348737
1983	432.052712084944
1984	399.6306607596239
1985	401.5938819822722
1986	408.2932430400129
1987	393.56156727233343
1988	398.54674848413856
1989	388.3856576072941
1990	369.66582262054203
1991	351.9419978329417
1992	364.52903004019265
1993	323.75413269458517
1994	189.51218436203908
1995	305.7103756872201
1996	288.5167810716123
1997	287.8811591416956
1998	303.3938635705582
1999	313.81830675642533
2000	335.11095640860196
2001	357.14848335655796
2002	397.8028300553128
2003	395.61271246565536
2004	414.26922795285645
2005	443.41421166304934
2006	471.60898818004347
2007	496.40811594235674
2008	535.8598485309457
2009	554.8070626608389
2010	579.1481659824387
2011	609.3618800424308
2012	642.7319635587465
2013	654.9902846450569
2014	674.7965453681671
2015	719.9439248809082
2016	738.2100260845526
2017	744.9464074244506
2018	785.6194395802032
2019	841.6777387199062
2020	802.5280548958717
2021	871.2915477247866
2022	920.550117591965
2023	975.1734199465898