Year	current US$
1960	2.11991916167169
1961	14.894987731579286
1962	15.897725186788428
1963	15.278409002951246
1964	12.633361669023595
1965	11.737715735949093
1966	13.476831651234727
1967	9.963256274529673
1968	7.992412645580394
1969	7.727598611702268
1970	5.770592924007011
1971	2.742283912003993
1972	3.7562471248202183
1973	3.85919756815218
1974	1.4494770190747353
1975	10.629227579476106
1976	0.9643800472077818
1977	0.9772229809501506
1978	0.3375906862377619
1979	-2.644119266292574
1980	-0.6582487715364921
1981	0.047260551791929235
1982	-0.0694479256452765
1983	0.7122273179990861
1984	0.9507927463433912
1985	4.00522577174097
1986	0.29805421095250056
1987	2.2717289274140584
1988	4.0198511056739195
1989	5.234366327540093
1990	8.179650686018027
1991	9.215492568133406
1992	9.912715936769322
1993	12.767186247093273
1994	10.9213677654024
1995	11.14949573352942
1996	13.45148881521849
1997	8.827567328015478
1998	7.172224311026622
1999	4.690173783205369
2000	3.292122370513534
2001	3.598304546061042
2002	-0.45049667235647856
2003	5.06522697052992
2004	3.3780818744621883
2005	10.556211253063388
2006	6.054029528754093
2007	6.4835713117233285
2008	6.2191422785456645
2009	4.553434690225888
2010	10.697969336101892
2011	9.386514789219575
2012	7.385635632661451
2013	4.600819110224276
2014	13.884689449007434
2015	3.040269996506723
2016	9.867352156105778
2017	3.8277324127282046