Year	constant 2015 US$
1971	1325.2746209474424
1972	1360.9920495088977
1973	1402.0510047780695
1974	1310.0716404743364
1975	1289.7745468544608
1976	1492.329160088243
1977	1663.0800617365765
1978	1661.7632319065094
1979	1619.5379157655468
1980	1572.8065524466826
1981	1398.6876001046996
1982	1220.151879033846
1983	1248.0576291780708
1984	1369.4158063982202
1985	1422.5071454989452
1986	1483.8396143954244
1987	1533.045516877927
1988	1551.1694671337937
1989	1499.4314181677712
1990	1433.4632208672533
1991	1393.108591230673
1992	1409.4524466481798
1993	1549.2051859020419
1994	1558.1618857634778
1995	1597.485138737988
1996	1551.0873957999468
1997	1584.839228299255
1998	1637.126691058511
1999	1620.3519447287067
2000	1678.8664497706723
2001	1661.7281495909854
2002	1653.301614261662
2003	1653.5918646354844
2004	1670.5049683945226
2005	1713.4745350039636
2006	1752.1942790915878
2007	1837.3651187376097
2008	1821.7553385632436
2009	1804.334446844119
2010	1767.2140158667414
2011	1855.64976701202
2012	1839.6180807218113
2013	1799.4031885631478
2014	1838.5788725119316
2015	1984.1046493744532
2016	2017.846476082916
2017	2114.6334245313005
2018	2063.5788639051484
2019	2102.212800367212
2020	2007.9618444474
2021	2115.9867672826026