Year	current US$
1960	5.080811172505139
1961	9.214753059525169
1962	6.432209910724353
1963	7.426128226643645
1964	7.7720042290971945
1965	7.966743134025414
1966	7.148523112961858
1967	4.409006328208584
1968	6.396791572702223
1969	5.218128062090685
1970	5.60154716613451
1971	8.452986437234792
1972	6.308515255180663
1973	5.710317338751428
1974	6.788983541551508
1975	15.590471483309146
1976	14.16437743230913
1977	33.267840273579964
1978	22.95841662142969
1979	28.03576319942287
1980	58.99043470206842
1981	51.66699040817666
1982	40.996269925809834
1983	20.988020967882193
1984	15.573441289411127
1985	38.76682338509793
1986	18.742185408543847
1987	18.28999988809771
1988	20.373018114879308
1989	20.669117340110347
1990	50.51073870895405
1991	61.33603942108365
1992	37.542306967969594
1993	30.224618905336378
1994	26.08700605285733
1995	18.818718533031483
1996	24.059698111172438
1997	17.2120292929568
1998	19.113894894367533
1999	24.202011393953942
2000	15.667629852785044
2001	17.07045801137535
2002	12.435748085125166
2003	19.70212383517085
2004	25.99130045860822
2005	24.074736263557828
2006	35.72565898006624
2007	39.08059771394586
2008	45.983888700584465
2009	32.92775413349869
2010	30.35589397953757
2011	43.77137021081976
2012	44.108975487705465
2013	59.42042660569679
2014	65.40850446786837
2015	43.77912279292505
2016	58.74283022533827
2017	68.33010680634561
2018	22.77613882095378
2019	20.70712762388592
2020	49.84004224205324
2021	26.059304774177846
2022	37.770333284419756