Year	base year varies by country
1969	23.11094408428851
1970	24.510100165895352
1971	26.698179258741835
1972	28.88000181253477
1973	31.454617975688688
1974	34.8895004434433
1975	38.48366966056182
1976	41.87335141679998
1977	44.516063631237564
1978	46.79472574788828
1979	49.20718213663079
1980	51.80476542516905
1981	54.224950655924545
1982	56.40964504946784
1983	57.43612371926936
1984	58.50336419014209
1985	59.49108806833524
1986	59.87831860213754
1987	60.07039266362404
1988	60.756938386534785
1989	61.69142523845169
1990	62.68062055496444
1991	64.55456841532572
1992	66.48026121561244
1993	67.57757461744166
1994	68.96700477443677
1995	70.28327726061512
1996	71.11665659010848
1997	72.54405557363793
1998	73.69999778818368
1999	75.10927582424789
2000	77.57587590045955
2001	80.27612309278666
2002	83.16132879898038
2003	85.12265441070575
2004	86.40307772179254
2005	87.89562280976642
2006	90.08814679378906
2007	92.27196011922383
2008	94.28890781430331
2009	94.3547986901495
2010	96.03019813809553
2011	96.89743504032883
2012	98.14815625869643
2013	99.35065770231229
2014	99.93896036861094
2015	100
2016	100.37894391282869
2017	101.66835220070098
2018	104.30577455195203
2019	107.25746301472314
2020	109.34375766842008
2021	112.72132985996168
2022	120.2315316648943
2023	127.98137176106643