Year	current US$
1967	241.13518970437926
1968	270.59360351477
1969	299.07901841805443
1970	319.04548024254876
1971	344.92909333316635
1972	422.4813573347338
1973	511.31175178586705
1974	701.9714136764301
1975	921.541654773438
1976	1141.0446109024497
1977	1186.0688830569518
1978	1270.7377425856591
1979	1487.3291063661645
1980	1675.2601156762182
1981	1716.8377662135658
1982	1838.6561135467975
1983	1798.5897048139814
1984	1777.8254729724154
1985	1910.1034077744212
1986	1990.0064193149703
1987	2050.9794765294932
1988	1960.2229104512107
1989	1793.7987101476795
1990	2007.2634630288
1991	1205.7401929492958
1992	1226.8326031662887
1993	1198.5475127014142
1994	1245.1736108911944
1995	1239.382712106807
1996	1352.8870911202525
1997	1438.2724789356016
1998	1470.9753372898006
1999	1507.939044414864
2000	1595.512713878758
2001	1640.0324922666864
2002	1599.0048471882296
2003	1661.0814952282046
2004	1877.724433749061
2005	2126.570639392355
2006	2411.81131513
2007	2816.2953148339493
2008	3308.8972592091845
2009	3614.465987220654
2010	3937.2851672575525
2011	4107.6396197749045
2012	4600.414515577314
2013	4688.8215032871885
2014	4535.164900641207
2015	4094.3906595892718
2016	3993.2257195435463
2017	3827.633419361467
2018	3733.69737125349
2019	3597.7964597299297
2020	3205.420956780546
2021	3513.9770118089664
2022	3874.889380986961
2023	3968.0509907644037