Year	constant 2015 US$
1970	1475.9226761141495
1971	1471.1716240243888
1972	1484.7167093327819
1973	1484.926623359682
1974	1334.8008490678728
1975	1261.1670864898429
1976	1399.6553979191017
1977	1378.711880848795
1978	1260.3055121764726
1979	983.1604403769907
1980	1020.3052822702421
1981	1069.8219956532673
1982	1213.9320541658249
1983	1286.589896455656
1984	1324.086844258263
1985	1351.9758872798523
1986	1538.4940792553268
1987	1619.1736279193096
1988	1547.400482700352
1989	1525.1092663823647
1990	1489.2088203683306
1991	1708.5919320903774
1992	1817.6069895045327
1993	1782.915244735657
1994	1850.113524918262
1995	1904.3151216720073
1996	1978.587072568876
1997	2115.1570686702253
1998	2052.852026317034
1999	2090.205497849705
2000	2185.7937698890887
2001	2315.7772934365057
2002	2296.247832674473
2003	2269.5254796125296
2004	2256.200382998681
2005	2252.9922671186137
2006	2399.3624865917595
2007	2526.5453612269953
2008	2571.1333448698315
2009	2681.3946338300207
2010	2725.1993551905603
2011	2731.6071683134187
2012	2808.4820246400363
2013	2829.9181828294195
2014	2856.167817512335
2015	3040.473382203848
2016	3120.489216636215
2017	2886.7365588987604
2018	2932.3798547462197
2019	3032.021197769626
2020	3156.498510383504
2021	3159.03336261125