Year	constant 2015 US$
1971	683.8441031596543
1972	709.4147091743331
1973	722.3012761694124
1974	702.3328883015658
1975	638.22757168893
1976	619.9145743674873
1977	608.8056069770496
1978	616.431439285634
1979	671.0892651278419
1980	708.7901645743713
1981	724.4078122537286
1982	671.7196243596032
1983	622.6272390289379
1984	639.4849928613493
1985	681.1664776719806
1986	653.1388874955577
1987	620.9351414392972
1988	629.5152038498294
1989	572.8430507893844
1990	614.0163591897337
1991	629.0078445019092
1992	587.9529157253147
1993	614.7874101540343
1994	537.9604021704355
1995	558.7806246927024
1996	579.3429867985325
1997	604.5391742712172
1998	611.2759974906937
1999	655.7742635301832
2000	691.9846903308533
2001	721.3432867706597
2002	757.6486612103025
2003	772.3464019389301
2004	798.532916473617
2005	778.0420154462425
2006	783.5637746847211
2007	803.5022667574846
2008	821.188875867475
2009	816.0550011579883
2010	807.8308287599738
2011	821.7198164434986
2012	847.3181788923824
2013	904.1743621404895
2014	932.5573189317467
2015	933.9750394492966
2016	947.4641200218833
2017	954.1239414615966
2018	984.6999633573196
2019	1032.9977873284315
2020	1031.6036232741978
2021	1086.7927078847886