Year	current US$
1970	407.17401364654444
1971	380.343167002582
1972	459.4393307778187
1973	568.2147717240106
1974	770.87226265067
1975	951.5493353013757
1976	1066.2330047599642
1977	1197.9151642422148
1978	1298.3673480476143
1979	1733.8217201840018
1980	1297.8171917194577
1981	1308.3428105127405
1982	1160.8019261768256
1983	1082.0595823447136
1984	1027.4688950764241
1985	1129.2896120864436
1986	1245.600314597875
1987	1379.877300745588
1988	1394.8604485992435
1989	1643.343788127374
1990	2300.137620542778
1991	2239.7318204243575
1992	2330.596357734659
1993	2621.953554559822
1994	1817.5666379009726
1995	2351.0554815465316
1996	2489.1703135178477
1997	2572.152281150484
1998	3699.737597536456
1999	3343.6537863504377
2000	3533.742929523553
2001	2471.546172374245
2002	2911.222377877
2003	3818.689281049054
2004	4956.247673015896
2005	6114.867707964526
2006	6657.900588558254
2007	8093.660401755138
2008	9024.59580737861
2009	7429.972223922401
2010	8905.316612011842
2011	9534.737344409728
2012	9895.728768316829
2013	10665.187201890187
2014	10269.293408231391
2015	9294.2728117552
2016	9193.574205665605
2017	8921.211219741117
2018	8063.6011977865255
2019	7621.523126571094
2020	7197.801954624627