Year	constant 2015 US$
1968	1101.7877953287066
1969	1001.7282523720489
1970	1051.9347249435546
1971	1019.2032584207317
1972	1051.4614270194388
1973	956.0468363270495
1974	964.42495107539
1975	1006.6293195954437
1976	1075.4727649290767
1977	1023.7925994822995
1978	955.9573358632945
1979	1003.2326231001592
1980	1016.0653415966401
1981	1036.0499978149849
1982	1091.0499659816776
1983	1002.8898152405602
1984	1006.0355850049699
1985	1013.4300805415287
1986	1017.4884493624196
1987	1049.9099855119323
1988	1009.3100794290054
1989	1022.7302440179178
1990	990.7371541474998
1991	987.9893939711387
1992	982.3371026614008
1993	960.4783046996307
1994	935.2691279868411
1995	963.9051356609859
1996	971.7611450418133
1997	977.1311781073917
1998	1014.5993990468356
1999	1047.605661561356
2000	1062.4886994124984
2001	1084.8029905058875
2002	1057.3282946748543
2003	1093.0170442857645
2004	1117.7629088825374
2005	1137.3986012767514
2006	1136.9310666366612
2007	1138.823109159335
2008	1153.0731272111882
2009	1144.6709499948154
2010	1153.2049204811965
2011	1130.1513341330876
2012	1142.7765299810162
2013	1138.4084503267661
2014	1173.2500784974534
2015	1205.9238733864129
2016	1247.2664508719597
2017	1301.2275558135734
2018	1348.255908815226
2019	1372.7118246312573
2020	1367.5524219517988
2021	1405.8855051576707
2022	1413.3243868735897
2023	1423.4503334521128