Year	constant 2015 US$
1967	383.4273786535592
1968	388.162091221161
1969	382.40225935913105
1970	395.9116188252397
1971	398.4394726018985
1972	415.5655116534886
1973	406.99206913395454
1974	430.84199236547437
1975	450.96418976806825
1976	492.67644846621647
1977	479.84056225772105
1978	496.2805176870017
1979	522.8317139687279
1980	483.58244338128446
1981	497.2385251047652
1982	458.7359513633402
1983	464.116785723849
1984	460.04324767936544
1985	436.1263839830583
1986	402.61331403975976
1987	366.0732223846404
1988	392.74332729561957
1989	374.86631890135374
1990	368.63032985179245
1991	433.35234937260986
1992	389.70253583974215
1993	411.668568005383
1994	399.19680385238786
1995	401.183826425097
1996	418.98350417294773
1997	400.4411895120874
1998	395.54933588886917
1999	421.8601862302727
2000	402.8019201250184
2001	418.975825259375
2002	397.4068955749921
2003	414.94440369047743
2004	419.6600451419393
2005	433.49146772227294
2006	438.55509652380505
2007	449.1680481260478
2008	469.5322482927881
2009	480.4097478076269
2010	514.4049625903197
2011	508.9881198127177
2012	500.19101740058767
2013	523.734954848168
2014	550.8700834307017
2015	567.3703635004521
2016	581.7449404617541
2017	582.5597456231749
2018	581.285510941136
2019	584.8007171354302
2020	577.4759822623031
2021	576.3101732230501
2022	581.0952189918286
2023	590.1206156369836