Year	current US$
1970	185.36022974310768
1971	160.63211529771542
1972	172.15359427395038
1973	171.56994524795604
1974	218.49900777084386
1975	261.59294169882935
1976	307.3931024858851
1977	306.98564255464055
1978	337.7094776862901
1979	344.3441177518148
1980	455.55656766784324
1981	978.9712881564445
1982	876.9136176516009
1983	637.2051418161086
1984	526.7260508287704
1985	504.3595569712417
1986	448.87643965207127
1987	432.7228547015108
1988	440.1131565444003
1989	388.25797716495146
1990	404.2347780730511
1991	408.2423775099914
1992	396.13415882787166
1993	339.15585477209896
1994	337.3123407043571
1995	391.7218390026316
1996	423.027186614025
1997	422.07937927066695
1998	412.40694951019873
1999	424.2475277174871
2000	439.3452373483225
2001	437.02292521265747
2002	478.19859591609315
2003	524.0224215980506
2004	618.6394402536657
2005	712.4426003979098
2006	908.2315355870409
2007	1015.6491404548799
2008	1160.2725420664374
2009	1104.619890029182
2010	1236.8518020373617
2011	1372.4583314895226
2012	1504.4733347481308
2013	1623.47934598446
2014	1769.1077745655004
2015	1678.7103453004393
2016	1604.0932915306792
2017	1528.8647231127131
2018	1611.40148531838
2019	1572.5190211008862
2020	1483.4942211070304
2021	1566.6330120875841