Year	constant 2015 US$
1971	687.66921290429
1972	670.1928348051027
1973	613.7653193073221
1974	662.5737737536277
1975	717.4431536394493
1976	648.5038475112593
1977	645.9881184454243
1978	926.051710516576
1979	907.3352957748882
1980	745.8313035927011
1981	943.1325899597359
1982	1214.9922387176225
1983	1180.7533755630932
1984	1226.9379946734987
1985	1268.1065008272813
1986	1528.2733292166708
1987	1349.0713756327903
1988	1152.9834632453708
1989	915.3376291225128
1990	839.8803433231643
1991	830.9065214669417
1992	691.830658049376
1993	800.7479327836035
1994	770.2845938015889
1995	755.8408393984429
1996	748.8362853811738
1997	798.700500975779
1998	834.142341644121
1999	865.1130712314819
2000	850.6210362673664
2001	863.9354662314789
2002	872.6722797246797
2003	922.9082557922549
2004	983.4819015559403
2005	970.5605458180761
2006	987.6964090907695
2007	978.3936643778521
2008	959.7378565518936
2009	1011.9661460621377
2010	994.7854370748462
2011	984.8927536558141
2012	1004.9123690405386
2013	1062.46343200134
2014	1111.6204565631547
2015	1135.303711600048
2016	1162.1817471098962
2017	1165.3852511187258
2018	1188.4317198243987
2019	1213.4916784360355
2020	1239.7332613748815
2021	1194.5353158344356