Year	current US$
1960	2.164646358060352
1961	2.649336116974996
1962	2.624122634985069
1963	1.3045299879340762
1964	-0.24368349401103034
1965	-2.591406548140869
1966	-0.4142280802800463
1967	0.39460359527995764
1968	0.11768283829068232
1969	0.7489766083998408
1970	-0.1023369633687977
1971	0.20558651289209032
1972	0.07678933101601101
1973	0.5419537070678234
1974	0.6267251074122406
1975	0.4637581148974642
1976	0.5359399930015101
1977	0.6135410035438039
1978	0.6173994519836481
1979	1.02486452747669
1980	1.558619352477725
1981	1.2935841087276077
1982	1.0196121577572088
1983	1.1716593815437255
1984	1.0974720258942645
1985	1.290317869562958
1986	2.3959027287841717
1987	2.6713476828917235
1988	4.495943040096284
1989	6.267843912386603
1990	5.25864969053425
1991	8.390381729418893
1992	7.945893303346537
1993	7.228032510078454
1994	4.6658765576102095
1995	4.240242838924876
1996	3.459796829380705
1997	2.7713893931908338
1998	2.0412221192327284
1999	2.247563025644946
2000	2.0112878559965814
2001	4.205921181176779
2002	2.612905495642487
2003	3.0753826442852117
2004	2.5172750746594383
2005	2.402579960430556
2006	2.8930878778672846
2007	2.2627583556714845
2008	3.1042537052607613
2009	2.8519573989208578
2010	3.194776657957437
2011	2.3520721876926354
2012	4.259431150432373
2013	0.8229285366583224
2014	1.1434397149141025
2015	-0.4374945681639784
2016	0.060105018740816314
2017	-0.026563854640780725
2018	1.645596600242949
2019	0.19782499203187556
2020	2.2418964384245306
2021	3.3893089131391436
2022	8.306941051242516