Year	constant 2015 US$
1967	340.2690239524876
1968	347.85074217441866
1969	343.5926673062127
1970	359.23710614714963
1971	362.905122321818
1972	378.1051920521087
1973	366.3637507478241
1974	354.50130551198646
1975	388.72856957244215
1976	433.87801884455143
1977	452.92803550955296
1978	437.61691009437334
1979	473.3957814311138
1980	443.4259654544164
1981	440.5388953078375
1982	399.36661387885204
1983	397.97236555456936
1984	388.6191194085437
1985	458.4617585502386
1986	462.5061797507161
1987	454.2464604347944
1988	479.71092035880685
1989	490.82806002672237
1990	469.4024925731396
1991	514.2473821295149
1992	487.72065385064855
1993	492.82071933284914
1994	500.6380589998752
1995	494.5902322128102
1996	518.4705463062354
1997	531.5771853028538
1998	557.764341335031
1999	573.5489901245413
2000	556.77239407158
2001	623.2663744374795
2002	622.7967228945136
2003	658.1427188215351
2004	646.9280496500121
2005	666.7944218670058
2006	675.1889494681409
2007	676.0800317733559
2008	685.4606705643431
2009	695.39448652741
2010	708.9304739407845
2011	708.4186724799583
2012	682.2878441881711
2013	677.861141016751
2014	703.231034477626
2015	723.5042049476626
2016	741.7976346831314
2017	756.428073205064
2018	767.5715955218592
2019	779.3266249814333
2020	745.8859847854025
2021	744.7604273195938
2022	747.1529264728193
2023	762.6460414306385