Year	current US$
1960	0.5223381540939739
1961	0.2861950843087957
1962	0.9339117543408013
1963	1.511600845813254
1964	8.452894721689978
1965	8.791698452495712
1966	8.035090395260662
1967	7.154650693463118
1968	7.753732848634884
1969	7.0647613507203975
1970	7.221656469186797
1971	6.853343434234759
1972	7.7576659442638665
1973	7.222888715233829
1974	8.375673307363185
1975	10.647778839695519
1976	7.711939562794121
1977	7.392184519933236
1978	10.71802741155354
1979	15.77144942349374
1980	25.653313278387007
1981	25.303807054127535
1982	25.353209655715823
1983	18.601473895901247
1984	14.998477457788336
1985	17.93013727369543
1986	29.26024593303359
1987	30.35577534153953
1988	26.410777519441833
1989	30.09777385751704
1990	33.40637399411669
1991	37.16621658924049
1992	28.64138417488562
1993	27.74325859407401
1994	21.445178608352666
1995	21.588220094292016
1996	24.773259438543054
1997	56.68011914755486
1998	31.77969384876585
1999	23.03684850842391
2000	20.009335653839493
2001	22.41397411493869
2002	21.72562377019375
2003	30.769038983834236
2004	68.62832335391639
2005	48.75168624285416
2006	40.53735671704768
2007	34.536083081470636
2008	30.78738146137077
2009	18.899382836591137
2010	21.96442103190278
2011	20.01417740018202
2012	16.044854979934676
2013	21.16662937151742
2014	24.286446068380148
2015	27.262983739414675
2016	24.37383166598354
2017	29.768957287343586
2018	28.123176455604654
2019	26.597407965202727
2020	46.01175544111734
2021	36.94400433445615
2022	33.76670511705057