Year	current US$
1960	1.7587573670708896
1961	2.172711867742496
1962	2.1919969889368223
1963	2.2969679306522517
1964	2.2880530890199307
1965	2.3821417902544764
1966	2.3715947507570396
1967	2.3732258424789707
1968	2.0854682679304095
1969	2.027886452025173
1970	2.2235943778924354
1971	2.481710680032339
1972	2.549748356836647
1973	3.3926587763090246
1974	4.572152157866523
1975	5.670119087486591
1976	5.260335998716574
1977	5.2818541482977635
1978	7.244417178394157
1979	7.9467713573388
1980	9.548830904905852
1981	8.922962458561722
1982	7.988626834139946
1983	7.341077582160745
1984	7.502677429724581
1985	7.713398558580639
1986	8.93813399541077
1987	9.92253396329724
1988	10.513707713464738
1989	10.625052889450277
1990	13.201243976025447
1991	13.727228172915225
1992	13.187621457621583
1993	11.97475242657608
1994	12.68742744718075
1995	12.371624423550848
1996	11.144071191232491
1997	9.92698238696766
1998	10.245019881882332
1999	10.55704154493406
2000	9.881833143626025
2001	10.177971827519375
2002	11.98037544361978
2003	13.660654894792248
2004	15.09433235295131
2005	20.322275293749904
2006	19.721534198440775
2007	18.165825564059073
2008	21.51571865557218
2009	20.507018398113903
2010	22.726188785229954
2011	24.331962766046
2012	22.995094247582422
2013	25.690715601601987
2014	27.124938773402985
2015	24.310554386473722
2016	25.94222611272715
2017	26.62397097417185
2018	26.67776648608982
2019	25.651351348521125
2020	30.075840490045753
2021	31.21137115487972
2022	37.21596440964607