Year	current US$
1960	2.5930702320271606
1961	3.43002201596871
1962	2.6692645606294922
1963	3.227928891930257
1964	4.587721884738521
1965	4.8554899182196944
1966	3.9320707636325585
1967	3.4504456577782148
1968	6.183801228279302
1969	4.590244626185754
1970	5.009427563417702
1971	4.094157167205243
1972	5.524317967871711
1973	4.581984215178315
1974	6.217043690513652
1975	11.644275311171107
1976	8.951024069549216
1977	9.401003066476894
1978	14.114030041491924
1979	19.23152595256833
1980	22.961945373068748
1981	22.56056349548542
1982	30.4284720348691
1983	35.39334023918165
1984	50.467875231296276
1985	54.222117103933435
1986	59.23950209586037
1987	54.20673160318404
1988	61.40079639849803
1989	49.77943317864588
1990	81.343944846601
1991	57.64989812237904
1992	58.868721979346184
1993	52.45012500063109
1994	45.28444971994437
1995	64.45567555156144
1996	39.94444884214789
1997	44.84293076260198
1998	44.93910394755551
1999	116.90865186161734
2000	60.0670759425267
2001	82.22600605657237
2002	54.429487728028775
2003	44.052381560543004
2004	73.078730093603
2005	85.84179856280328
2006	66.90982550079404
2007	45.80500366918638
2008	50.729611540776794
2009	44.58215841510579
2010	55.674326136534276
2011	41.66423117924909
2012	64.39562889508662
2013	69.84644040243789
2014	66.42093099476864
2015	58.1633960696065
2016	43.5904026168283
2017	45.937183864275326
2018	67.90056035182873
2019	45.40694615873322
2020	116.91243762095202
2021	60.05927973410058
2022	75.28520486629803