Year	current US$
1960	1.892421368574177
1961	2.30929347658971
1962	3.008024975043222
1963	2.60449014394183
1964	3.3570743816356012
1965	3.830981979469724
1966	4.005639543205217
1967	3.234092613737663
1968	3.2842349606955
1969	3.0383890486988427
1970	3.109373123924763
1971	3.681992455247529
1972	4.6021796271506945
1973	7.16271496365058
1974	12.24131067733835
1975	15.03261114293305
1976	14.301542789693134
1977	16.72454321309743
1978	18.671614417911048
1979	26.619108383358505
1980	28.50869046658625
1981	26.50687001150459
1982	24.422814697675125
1983	22.298536683681125
1984	20.99214210762595
1985	24.310008453188594
1986	26.337375188055866
1987	29.806154770538903
1988	29.157646301660357
1989	27.753860447766836
1990	35.50274539146499
1991	32.64219869861696
1992	30.804933697562223
1993	28.188106855704273
1994	29.701838543030703
1995	25.23700310416268
1996	21.713365897337603
1997	20.17289242171672
1998	18.985302276291684
1999	17.665280157919188
2000	16.56400413180201
2001	19.976621608478602
2002	27.78668726059041
2003	39.42683105712993
2004	37.51004094320525
2005	39.836916762747954
2006	42.734731531621435
2007	42.419196220595545
2008	49.67547432570731
2009	48.91369920268343
2010	58.112576238986975
2011	61.7218827603907
2012	57.0156861549914
2013	59.70912766554088
2014	59.229776743801295
2015	58.73698790310395
2016	64.52159129793543
2017	70.4208508517247
2018	76.59156397965707
2019	70.70033881234542
2020	79.43204958209975
2021	75.48257779310603
2022	65.59257748453003