Year	current US$
1960	3.3135322244415337
1961	1.6764811284467716
1962	1.1072984611438934
1963	1.6697584551847917
1964	2.1335851496969074
1965	3.032086138315581
1966	3.7655379955846744
1967	1.4330700994964392
1968	3.0266290490152694
1969	0.8106768917721542
1970	0.6890630707528045
1971	0.7627097328476445
1972	5.278147720929001
1973	2.9800496140901576
1974	16.15015190856934
1975	21.7691461751421
1976	18.654193379005
1977	20.822626599134814
1978	24.691936685711358
1979	43.459495088771554
1980	40.311665088028334
1981	36.28233623524189
1982	41.36385119853716
1983	51.1124283970047
1984	32.07582375690793
1985	57.626616084477504
1986	47.001495728782906
1987	44.01713164213255
1988	45.49125865947699
1989	35.80918014294018
1990	40.21831943116923
1991	40.41771539439321
1992	24.62390012619314
1993	20.209128791461325
1994	17.983467426198125
1995	10.194240263767377
1996	9.139956751096898
1997	5.681601737366471
1998	8.438562929434061
1999	9.609832236290423
2000	8.566559104720705
2001	7.134678792930619
2002	11.060082537886615
2003	22.002571447298354
2004	34.4962382213181
2005	61.817004635744254
2006	67.53180042936286
2007	67.98688743637517
2008	80.07611457245494
2009	71.0540574322371
2010	60.0430942048978
2011	50.62228525256581
2012	38.94021912538078
2013	41.88109118550973
2014	23.63792669199096
2015	25.40398444624976
2016	20.547186285927996
2017	21.199941483148134
2018	23.037658952277813
2019	35.515977764734636
2020	52.86463514654183
2021	83.69982899959572
2022	33.2466453015328