Year	current US$
1971	235.31703528608244
1972	199.39563455388625
1973	224.09836638852252
1974	256.9622793225381
1975	236.50659669647973
1976	226.28055767034868
1977	252.092247217455
1978	286.9176781374181
1979	304.64986555501264
1980	319.3229611292088
1981	301.0778991082907
1982	276.9762607945871
1983	270.1494295745206
1984	282.485505020893
1985	280.19508216748955
1986	345.8080489549805
1987	296.00443465632367
1988	295.85813831397394
1989	292.69779379217346
1990	315.87395189089233
1991	348.48417181593544
1992	326.6379734944311
1993	287.9233718091585
1994	244.58205057713306
1995	283.3519813675843
1996	295.31420496920646
1997	290.2727571441731
1998	308.7486560423866
1999	327.08618947799454
2000	190.3497116495831
2001	202.33114927389448
2002	226.12055400089054
2003	262.88326937284035
2004	310.8287284939984
2005	376.2137152011457
2006	739.3080478973734
2007	866.1538767405705
2008	977.8787765160793
2009	855.4245711060368
2010	1023.8612528058276
2011	1143.8766987060988
2012	1151.2858763114994
2013	1839.7889570629002
2014	1489.1438905729774
2015	1350.6952929389274
2016	1517.5100532221925
2017	1556.1538831975747
2018	1728.1659101030652
2019	1728.3921910505044
2020	1835.4034403041592
2021	1823.9029219527465