Year	constant 2015 US$
1969	819.6431310422582
1970	840.1317780719514
1971	844.8550829049332
1972	812.7797510172454
1973	766.6448406145292
1974	755.2191281497394
1975	743.5991530928362
1976	699.5463908619972
1977	698.7916102279713
1978	660.5367001734553
1979	702.347987251396
1980	684.9276156975599
1981	594.0099282934211
1982	565.7661595339135
1983	552.1176492059467
1984	539.3150719225628
1985	532.2863620035946
1986	527.1820334401399
1987	508.8083097375634
1988	510.63420021409894
1989	516.2722496868564
1990	525.7426603416618
1991	474.36636201103994
1992	470.30450789607954
1993	466.57122645830907
1994	448.89968870746054
1995	442.4780065975486
1996	442.2047852545291
1997	445.3638379508209
1998	449.5021166962096
1999	457.834199062339
2000	465.4800607531524
2001	479.6494804504616
2002	408.0444243476859
2003	435.1874129247771
2004	446.3942600046503
2005	451.15955932868695
2006	460.748762159072
2007	479.4609774205265
2008	497.2880990095163
2009	461.23920705335973
2010	449.51820338710047
2011	443.6578974510393
2012	438.08569884094925
2013	435.314473040786
2014	441.45326964124854
2015	438.4055799541166
2016	442.7159213879265
2017	453.24252189949004
2018	454.57365658565453
2019	462.5566972730397
2020	422.9914420907523
2021	440.93976813683497
2022	444.3385558966086
2023	452.6319492314461