Year	current US$
1960	4.924503149503382
1961	4.443342890191334
1962	3.82804607741223
1963	4.016111795024418
1964	2.104009593049948
1965	1.5767995476442775
1966	1.8541949262331745
1967	2.169161889720258
1968	1.5610910092043793
1969	1.9012806861115934
1970	2.8068763139000152
1971	6.009267424704479
1972	9.92419944313329
1973	21.25982766167875
1974	44.50193069208543
1975	12.075050493119495
1976	0.11415666743250392
1977	0.049667256203883584
1978	0.04529294903366424
1979	17.844253793869534
1980	43.34115025244302
1981	17.668393693654714
1982	5.421696574066042
1983	5.671347615592313
1984	3.0572341248372594
1985	1.8763328745430032
1986	1.9983509910393604
1987	2.0838566491302655
1988	2.451093071129305
1989	2.8841683553233093
1990	4.635943381710279
1991	9.688572396723737
1992	20.01602190036555
1993	28.752727206807894
1994	27.922163756164824
1995	46.30053483742759
1996	34.38105526872461
1997	28.40380110613259
1998	26.423683410255244
1999	21.11857018024304
2000	28.514277690300087
2001	29.74503881930189
2002	32.42295605940225
2003	34.65514964462824
2004	31.26985155952239
2005	34.189948751046515
2006	35.34336080918941
2007	42.548222428423735
2008	41.541498325287755
2009	42.97267380995935
2010	47.41452019094913
2011	47.478761648457564
2012	54.62295710461647
2013	53.88180683369482
2014	52.770340519893246
2015	44.043389980825324
2016	46.622042046497434
2017	54.08861293185818
2018	48.88539093235701
2019	59.62827912292098
2020	83.78006401644888
2021	82.40690538726301
2022	92.25635245168996