Year	current US$
1970	1951.1475450510125
1971	2193.1682748355365
1972	2630.012082307589
1973	3391.9063995272068
1974	3786.2466060839483
1975	4342.709047471931
1976	4516.129507993917
1977	5104.2734242198285
1978	6240.440855128799
1979	7515.982972970768
1980	8323.590440448601
1981	7120.668532831496
1982	6831.829910436316
1983	6659.323036854961
1984	6383.417856229117
1985	6557.364207470099
1986	9254.33112316276
1987	11446.394879304267
1988	12571.69855385334
1989	12780.667122341185
1990	15977.762872480163
1991	16448.835371738263
1992	18037.856725145513
1993	16371.435396974086
1994	17199.620898145455
1995	19834.70330629911
1996	20051.524704237134
1997	18286.81561566492
1998	18755.721947985963
1999	18646.88067226335
2000	16906.18868082418
2001	17035.212626584114
2002	18391.25020520351
2003	22510.959087168496
2004	25806.304845608855
2005	26591.692750527985
2006	28200.01504968941
2007	32197.09048113852
2008	34822.769469113526
2009	31611.010327282875
2010	30899.813727569457
2011	33434.46372451268
2012	30824.376640307473
2013	32096.74277656579
2014	32770.26467345546
2015	28094.984361279065
2016	28848.281847725117
2017	30505.145760400268
2018	32963.837979004675
2019	32104.600624895178
2020	30620.226154399166
2021	34466.632268389134