Year	current US$
1971	175.39585800779858
1972	191.1588378946918
1973	238.33076299411368
1974	290.1749548442536
1975	311.76500805802243
1976	326.66817112194093
1977	335.4993371701514
1978	368.8477376178389
1979	402.63387265452405
1980	525.6617680323479
1981	812.3397873859647
1982	722.6337820420123
1983	605.8569403659175
1984	511.56980122572463
1985	451.1522965384995
1986	449.0298171219492
1987	489.2247580363219
1988	501.5365322662411
1989	472.8525032444208
1990	519.2415667287029
1991	531.305838648704
1992	513.8656637643022
1993	465.90355777245884
1994	441.4084872706663
1995	502.7500850923888
1996	509.401431881479
1997	518.1415216977575
1998	494.5556197139952
1999	492.8482577934953
2000	486.31044804784017
2001	455.1672031819631
2002	485.90062496828403
2003	598.9944002214252
2004	722.5667427748433
2005	819.6849624714264
2006	957.529903808965
2007	1046.9606488101174
2008	1115.0720535145203
2009	1115.7266911046868
2010	1252.220184589158
2011	1353.1478019487797
2012	1399.1466563291162
2013	1469.0864872033587
2014	1543.0931452568218
2015	1378.5229004845673
2016	1259.5367368638751
2017	1312.1216043273814
2018	1318.3224409878105
2019	1312.761249569783
2020	1227.9943382199815
2021	1305.2666591415914