Year	base year varies by country
1960	17.8474448992611
1961	18.6347926612691
1962	19.5121020854116
1963	19.8867453991228
1964	20.4593957168525
1965	20.9500490565286
1966	21.8238490662156
1967	22.6577542148995
1968	23.725390950121
1969	24.7546623647282
1970	26.468262848182
1971	28.2759750366631
1972	30.2819123365103
1973	34.608612576752
1974	40.4166779348062
1975	41.2516755283572
1976	42.4381841199014
1977	43.0825189161201
1978	44.9035851324757
1979	48.0911452173147
1980	53.765675646827
1981	58.459855141157
1982	61.0679117660907
1983	62.407611189113
1984	64.1776287831158
1985	63.1768224591092
1986	61.4747100415391
1987	62.7981815524774
1988	66.4440707499014
1989	70.01436101506
1990	72.5253023393757
1991	74.4917512643124
1992	76.7766558318067
1993	79.8156058962022
1994	82.6893052321054
1995	83.5379773360592
1996	85.1009654559333
1997	86.3139216776607
1998	85.5083951431948
1999	83.2666886683018
2000	82.5579028824858
2001	81.4094626032013
2002	79.5964487627115
2003	78.8350571102244
2004	80.6163428163739
2005	81.4730460010305
2006	83.5510575524163
2007	88.0830877289991
2008	92.250564187789
2009	94.244128621586
2010	93.5710099087615
2011	96.0402201184193
2012	98.0976290269445
2013	99.4027165814276
2014	100.123694043388
2015	100
2016	99.4394001544698
2017	100.256687565354
2018	101.270360896097