Year	current US$
1970	496.73542829852374
1971	546.7218518108559
1972	602.1085345151728
1973	775.8079617436779
1974	990.9433590999588
1975	1030.69168511659
1976	1104.3880058046423
1977	1168.1683764526895
1978	1288.8971392347796
1979	1462.1907818895386
1980	1677.6094176457773
1981	1892.0780021353078
1982	1688.4344781841073
1983	1407.0514055159163
1984	1403.5040062754322
1985	1349.372345757169
1986	1356.5486697713573
1987	1419.5861432157292
1988	1571.6639468629737
1989	1741.5944720430298
1990	1988.9797842444013
1991	2147.7580274239745
1992	2306.6970417918174
1993	2689.2924289997536
1994	3128.657806045903
1995	3288.1280655198307
1996	3553.974876398838
1997	3810.180855932437
1998	3746.397330189373
1999	3217.519267602508
2000	3481.397036617384
2001	3348.529523665319
2002	2945.431288676007
2003	2943.460743274973
2004	3287.4409499265457
2005	3893.3350865380994
2006	4532.001097276478
2007	5328.219056493355
2008	6036.197544342771
2009	5552.369443017363
2010	6784.225803276941
2011	7707.4461484723215
2012	7509.559333359218
2013	7698.978206770986
2014	7672.373714114054
2015	6556.88975282871
2016	6275.950218436621
2017	6961.161630545739
2018	6604.482552432204
2019	6471.220360504532
2020	5394.17674922795
2021	5983.854770192632