Year	current US$
1960	1.6167435757070168
1961	14.700531118015574
1966	14.607189807757518
1967	5.16557005099815
1968	2.8097779398103935
1975	9.763241091320664
1976	132.2691207626229
1977	33.66593164767085
1978	42.95319417513129
1979	31.04707628828231
1980	39.296367999617324
1981	60.50216799435313
1982	97.49234776815736
1983	112.81052044526157
1984	106.89302158237939
1985	114.53281715222263
1986	113.33810896490374
1987	154.2872440942075
1988	213.33822627278823
1989	378.90076205883605
1990	449.7145569903094
1991	414.4324064990836
1992	449.11180683477494
1993	362.68744190656093
1994	382.1192988625641
1995	631.8897806374549
1996	350.04284351371297
1997	242.7790882267776
1998	200.72966210703484
1999	194.06521816656112
2000	243.1217461535341
2001	261.04555173170564
2002	174.11789932386932
2003	246.15963940454145
2004	213.57413460735336
2005	202.25136543134278
2006	139.14617267124694
2007	282.257344206241
2008	221.08687858154465
2009	164.88143828726197
2010	275.560281911018
2011	394.96035000824315
2012	266.94888883416263
2013	277.409332307994
2014	209.52217536527237
2015	243.63079493247946
2016	229.87607468786553
2017	193.42806859614103
2018	246.8960571635618
2019	236.86038532823872
2020	421.3299552535069
2021	323.43227089293214
2022	233.66171636958043