Year	current US$
1971	502.4367740865244
1972	553.9635002648567
1973	674.0450178771706
1974	720.2230213747507
1975	817.2210526013544
1976	980.9257705168292
1977	1228.628444595863
1978	1359.7320059648894
1979	1504.5818509474566
1980	1737.3300617481525
1981	853.1253170382746
1982	782.8304854571974
1983	990.8402793887624
1984	1158.4804852391997
1985	1225.7493632058374
1986	1365.6667608851697
1987	1358.6085675947747
1988	1335.2727750146212
1989	1475.9984589763171
1990	1624.4197642279894
1991	2033.319687581865
1992	2370.44141395833
1993	2594.465778754694
1994	2815.7858503910547
1995	3026.015081623049
1996	2991.5381971166507
1997	3156.3637986605413
1998	3315.651222347106
1999	3300.078203467344
2000	3378.3685165429024
2001	3530.749080404281
2002	3595.9461670787264
2003	3687.505220674138
2004	3925.154877178259
2005	4166.283600032971
2006	4715.918286512499
2007	5543.463394543582
2008	6322.827453771601
2009	6119.072887278395
2010	7417.777521461184
2011	8301.60488959396
2012	9109.07152132419
2013	9678.351105199836
2014	9736.609781113571
2015	10446.759040717312
2016	10786.888023346273
2017	10833.446519930527
2018	11041.918998774068
2019	11300.935194467927
2020	10790.542539272767
2021	10968.731374290666