Year	current US$
1960	30.03533364052037
1961	24.804566194092214
1962	20.883858376238393
1963	16.391201291762385
1964	11.258385003752613
1965	4.640979832904489
1966	1.1495369377830376
1967	1.1301163010355801
1968	3.781481029354801
1969	3.908047200302095
1970	2.2522794852100456
1971	1.7208627219040196
1972	3.5224633557438954
1973	5.906184470437748
1974	5.198568775599901
1975	0.6763121666451904
1976	2.887610943172333
1977	2.486422118007235
1978	1.9319036037265747
1979	1.2176432840432287
1980	4.094210763906444
1981	1.5070621630102876
1982	32.95710301699946
1983	1.5334771199371888
1984	1.301708145939891
1985	1.4195319504812676
1986	2.826233917207186
1987	1.5669978786583636
1988	1.3676267821109445
1989	2.368014594759857
1990	1.9683817831197081
1991	1.7250229840591196
1992	0.7379376378323015
1993	0.6314672892360301
1994	0.8510554051462609
1995	1.233873318945446
1996	0.7821469624952252
1997	0.8118562049829796
1998	1.114242628378787
1999	0.9292213656994607
2005	4.083600089583617
2006	6.279538116853856
2007	3.1834404425871345
2008	11.913228813998238
2009	6.2954085680017
2010	1.1722141404935438
2011	103.60153525909563
2012	14.841896455386918
2013	21.524685860564713
2014	34.48477159484968
2015	25.414086370621916
2016	28.571220237821933
2017	67.70967746807288
2018	46.846200774720344
2019	44.783994740427595
2020	44.51195887727621
2021	51.014977721557116
2022	38.74586022734784