Year	current US$
1960	632.3852272486645
1961	676.2338429005703
1962	702.5591023449548
1963	755.5609965471906
1964	779.3892565628717
1965	793.3214950381929
1966	767.8086180192961
1967	797.31780167583
1968	784.2314087335008
1969	796.2053539496568
1970	831.0833358614204
1971	896.6377537662723
1972	1069.4451049224892
1973	1274.9334029794975
1974	1962.9429663643828
1975	2317.4840377794735
1976	2341.875012917322
1977	2901.624274786531
1978	3248.6176960440553
1979	4137.710373007525
1980	5528.946469335811
1981	6118.94104142692
1982	7034.945353774537
1983	6628.471756797945
1984	6547.459781145961
1985	6147.700102390793
1986	3941.6003719628443
1987	3896.0647580460773
1988	3612.994411580733
1989	3441.350429887846
1990	4001.522283931219
1991	4159.070729239492
1992	4231.462060095178
1993	3608.6416855205825
1994	3801.4695484104454
1995	4074.877286985549
1996	4385.0987002514075
1997	4352.812595359626
1998	4569.652412281593
1999	5130.866070983512
2000	6120.942703897061
2001	6592.776647953412
2002	6692.804355045123
2003	8352.463157618551
2004	9756.50037102982
2005	11673.781540367449
2006	13340.916273498038
2007	15627.28681790823
2008	20011.148274049716
2009	13682.763610029975
2010	15711.558705551332
2011	17910.319154168017
2012	19110.05389508059
2013	19927.40390469977
2014	20473.404028044988
2015	18508.770502876036
2016	16139.105257595025
2017	16258.748929143767
2018	16328.126892569479
2019	15642.406719057588
2020	13705.900228570972
2021	16056.302040927327
2022	19629.46534008295
2023	18332.96401760535