Year	base year varies by country
1967	10.299039060951584
1968	11.99383044902158
1969	12.433363530172915
1970	13.032079775229136
1971	14.08098831508191
1972	15.292237716913492
1973	16.278410332192212
1974	17.763276025681126
1975	21.148466642133638
1976	22.034787194068738
1977	24.429939221444073
1978	27.406510225514435
1979	30.312781781468047
1985	48.92529997129175
1986	47.91896861192511
1987	45.16772149073397
1988	44.96972115303189
1989	46.096893798827864
1990	49.26522888595857
1991	47.66769253344988
1992	49.17013424837699
1993	50.202038560731374
1994	74.13845830239573
1995	82.83393985380026
1996	81.13695856582524
1997	84.83122153060062
1998	82.0364319570809
1999	99.99998447855283
2000	101.01465841305482
2001	105.88016657205424
2002	110.8744780743331
2003	102.33421442673854
2004	105.8095173369948
2005	115.50099475887914
2006	115.84680485393666
2007	122.00797806897185
2008	130.5596748224984
2009	129.60863613155664
2010	133.25386436408553
2011	143.937023734097
2012	147.80467166915844
2013	155.28335390136522
2014	157.08640523115312
2015	159.37249356346783
2016	158.82812678517018
2017	170.556355686375
2018	177.28173450551256
2019	181.39588626878353
2020	173.1537949465001
2021	182.10862055352206
2022	195.70627294094913
2023	194.61665284260133