Year	constant 2015 US$
1966	537.3674904693403
1967	522.5479369148659
1968	556.506351720259
1969	553.9300555655691
1970	571.2860525283666
1971	554.5622493212053
1972	539.8013466551497
1973	572.4406091481193
1974	588.3496434593902
1975	641.840779513619
1976	668.3224979650076
1977	670.0595688877919
1978	690.1114142614248
1979	659.2178682054135
1980	677.7084107043254
1981	677.353215409594
1982	649.9286488070086
1983	695.9402731979418
1984	695.0038558226042
1985	664.2634127882234
1986	665.7547493024307
1987	656.3039896442396
1988	659.3360893065898
1989	671.0446035297082
1990	667.6238220738131
1991	661.1002094119101
1992	656.9906264669046
1993	652.938359340974
1994	633.5704196221155
1995	620.4930815963509
1996	615.983902591464
1997	627.5563463529625
1998	630.75294538312
1999	651.749189451799
2000	667.9653792431524
2001	686.6876858070148
2002	645.7017320925161
2003	670.6609409044937
2004	697.4724523896947
2005	661.3219110800603
2006	638.0769464838332
2007	637.5310006665334
2008	656.7039094791273
2009	679.0036124361286
2010	697.1625677887117
2011	620.9482229492229
2012	633.5827208588696
2013	632.197151619908
2014	605.0336940110027
2015	611.67121911225
2016	606.3162002522644
2017	618.4807687135018
2018	645.9381871515884
2019	668.63512259134
2020	655.5761192064227
2021	672.8022710278342
2022	688.6527914016898
2023	707.5587400973534