Year	current US$
1960	288.0581444760307
1961	270.2796466144866
1962	287.0447735378304
1963	308.19524841084893
1964	332.3049858752793
1965	328.48488392032783
1966	337.64622904410976
1967	333.23379884188716
1968	314.351070663894
1969	314.1798586362775
1970	343.8811884905696
1971	401.60802214305227
1972	546.9510953340721
1973	648.5319636576384
1974	744.5068982608128
1975	806.2326443381653
1976	814.4747744788797
1977	1044.353113389027
1978	1376.5465132826016
1979	2030.135903134091
1980	2478.364704008491
1981	2557.206655912245
1982	2440.684174086448
1983	2426.3346072521886
1984	2487.644992835651
1985	2754.145709659154
1986	3368.4740959658566
1987	3871.7785208969285
1988	4392.198648993682
1989	4689.134507154819
1990	5642.072897404745
1991	5654.639757242509
1992	6520.489505191885
1993	6978.6807544582425
1994	6974.86770636796
1995	7180.668327486557
1996	7004.336038963564
1997	7746.6985133044445
1998	8209.514442870004
1999	8243.236100990844
2000	8063.655005751688
2001	8153.298636987904
2002	8864.169194954675
2003	9070.284607570127
2004	10827.671636032957
2005	11802.111827683288
2006	12782.993892647544
2007	12669.30266872219
2008	11265.437627000474
2009	9747.09180546291
2010	10934.79494629001
2011	12110.09374619728
2012	12337.155466938775
2013	14821.292147607652
2014	15188.190217511252
2015	15333.105172710513
2016	16566.994604229385
2017	17480.365191137193
2018	18440.234046093155
2019	19141.5118743615
2020	14041.47540745751
2021	14982.911148776711
2022	17167.19097608326
2023	17879.239654507455