Year	base year varies by country
1970	13.443643707768075
1971	14.223327767953906
1972	14.964562234710884
1973	17.05662295173566
1974	21.267121342303213
1975	24.64982700732311
1976	27.194273831837094
1977	30.26657493683871
1978	32.59320327896198
1979	36.997271161931664
1980	45.93510207229465
1981	54.62224065465341
1982	62.118593766937536
1983	59.82643805775422
1984	59.57607633931574
1985	58.488816207513764
1986	48.31606093625101
1987	48.63448719688581
1988	49.61176205598544
1989	51.58366109880221
1990	54.07344738220181
1991	53.055501760227344
1992	51.181235053426555
1993	49.63258568480087
1994	53.271243574673875
1995	53.85225714034817
1996	53.958195300877954
1997	54.46093263331421
1998	50.61740074061323
1999	51.962019818779545
2000	59.40429226148244
2001	57.40603409272595
2002	59.366076762676244
2003	64.47309137583201
2004	71.55938340769858
2005	81.38804169547124
2006	88.58472777644094
2007	96.05741003523465
2008	106.97442298456792
2009	93.07422935180838
2010	100
2011	109.7367534959574
2012	113.04505966727125
2013	113.47931097169612
2014	111.58320445131815
2015	101.12860341268382
2016	101.26399931856274
2017	107.14464413130584
2018	111.77925002011484
2019	111.8723194137311
2020	105.08493973300507
2021	116.23885219509663
2022	125.18815972177941
2023	118.91383053636497