Year	current US$
1960	4.9910980109975736
1961	6.663598848065805
1962	7.9077215596749175
1963	7.465164153953867
1964	5.294513753928623
1965	6.037061509439025
1966	6.308748254796811
1967	5.987012114443255
1968	5.153748623293184
1969	4.9579529830082905
1970	4.946401410083344
1971	5.599291449599101
1972	6.252279651421109
1973	2.180484999854984
1974	1.2914457509583304
1975	1.474280539736051
1976	3.111775218256899
1977	2.2473970724598518
1978	4.152301741137646
1979	13.509008558642233
1980	21.613747223280697
1981	16.164287132480887
1982	14.091406459687882
1983	7.5672344931932
1984	4.998881149593413
1985	3.6623800980520587
1986	6.768890766914547
1987	7.392563345318235
1988	5.390247756265786
1989	2.7184948416530546
1990	24.001299009673083
1991	29.103324660165914
1992	6.32783479954148
1993	7.814331689326908
1994	3.4016321849362146
1995	5.287200182623801
1996	4.081349309049111
1997	0.11031795344800939
1998	0.45130150199353325
1999	0.19703851595438454
2000	5.1248140634649175
2001	2.0478847683321577
2002	4.143742121906698
2003	2.507053996485429
2004	4.26170517452128
2005	5.8122646542128305
2006	8.178866484721278
2007	11.42476550719244
2008	15.810463833824729
2009	18.836548124963095
2010	14.350001549316092
2011	44.30219949945118
2012	41.39854586335312
2013	37.398935623922156
2014	44.65775957906457
2015	27.375372637527636
2016	45.52450639296996
2017	39.33724190534453
2018	14.690715255506625
2019	8.480318924334785
2020	6.503592599899274
2021	12.591489119861194
2022	9.417166848961706