Year	base year varies by country
1960	1.386476904923755
1961	1.4051793234049301
1962	1.4286098312443274
1963	1.4513341857359794
1964	1.480367924009389
1965	1.5311791201136389
1966	1.5883993184658884
1967	1.4968357932525058
1968	1.5577178193677506
1969	1.646869157027829
1970	1.6795071482374162
1971	1.7800339851398597
1972	2.0282084937124103
1973	2.1694735713159727
1974	2.3825233459958657
1975	2.972487877381201
1976	3.1075264344333227
1977	3.3399350308023776
1978	3.8925755191326905
1979	3.987102259665915
1980	5.640134957361051
1981	6.349501257851149
1982	6.041382569927251
1983	6.739575591713827
1984	7.285680030563589
1985	8.648668983952124
1986	10.054360708367373
1987	11.23431871512824
1988	13.490293594539965
1989	15.492156561289145
1990	17.350270932508938
1991	20.443342255872317
1992	23.292937731528664
1993	25.924567747287963
1994	27.938034609175734
1995	31.518718093296744
1996	33.4104854411037
1997	36.4237573820675
1998	40.03780771125514
1999	43.29338298505027
2000	46.020960601759214
2001	51.300970686571205
2002	58.589264934564625
2003	60.01814744287515
2004	65.78012520467122
2005	69.67617887794901
2006	76.16371986714135
2007	71.07411408822641
2008	82.95757832421408
2009	84.90295914319276
2010	89.4343235824151
2011	97.86476692389168
2012	100.00022313041434
2013	110.28014171172636
2014	125.75812739721822
2015	138.58927841449537
2016	138.18397245967415
2017	140.97378283473213
2018	157.50023616291344
2019	163.13158539599092
2020	172.47384008389034
2021	178.219858256701
2022	185.25845931105954
2023	185.0842886922545