Year	base year varies by country
1960	0.10061731686337665
1961	0.1148050105222759
1962	0.3095727713379902
1963	0.7971467586693846
1964	1.714119931914502
1965	5.700803674292804
1966	0.07984693195600588
1967	0.2064824058463853
1968	0.4452594905289149
1969	0.5372788917402185
1970	0.5908753443130084
1971	0.5962445905212734
1972	0.6830252460469411
1973	0.9010269529337706
1974	1.1778044916032193
1975	1.371218088865196
1976	1.5665578959693394
1977	1.7095458822497582
1978	1.897620165971051
1979	2.1560509557020904
1980	2.5785370875849645
1981	2.863051537390649
1982	3.2036853831900816
1983	1.1804278922345484
1984	0.9426481514476615
1985	0.7402904076738609
1986	0.8688127677100494
1987	1.2144202169625247
1988	3.58672783042394
1989	3.5963212043010757
1990	2.614521188369153
1991	3.9862854667155285
1992	4.0185787091277705
1993	3.7072332912576265
1994	3.3768437582343034
1995	3.796561537283823
1996	7.489994223885807
1997	9.958993137319155
1998	208.1715616199545
1999	-87.25816878098075
2000	-38.84259245962794
2001	-31.194364589214214
2002	120.90702900927883
2003	-37.766355547666194
2004	-356.9902429310724
2005	-126.36101323713625
2006	-320.69752602895863
2007	68.7055227198
2008	87.44608443014927
2009	83.03276528812718
2010	100.00000029700315
2011	106.89491833910596
2012	113.25347801333739
2013	119.26131046078052
2014	126.95089348464077
2015	132.93596423443378
2016	136.71996662891752
2017	141.14286199884302
2018	145.66731572594432
2019	149.35087632548104
2020	151.99568526972485
2021	154.96867413417635
2022	161.76367330648972
2023	167.66237842650438