Year	base year varies by country
1976	13.753379727424159
1977	15.457950722207961
1978	15.527304772071446
1979	15.878894404561256
1980	16.932876707141553
1981	17.969741993517527
1982	19.125577622919437
1983	21.177779960289588
1984	21.705438014548463
1985	23.020781027406215
1986	24.80818474483174
1987	24.74484864231132
1988	25.05909587612214
1989	28.97766652595698
1990	33.07837441983364
1991	34.87626906643066
1992	37.226469636660624
1993	38.33171578439939
1994	40.96193549182826
1995	41.73390065897641
1996	42.588012733430816
1997	43.11847177184572
1998	45.707478444346485
1999	45.53689419137011
2000	45.34843083974216
2001	45.699386609773086
2002	46.121881886015125
2003	47.112240038515154
2004	48.570401322658434
2005	49.544953944191825
2006	54.82121980834449
2007	57.5890984477029
2008	71.194341219471
2009	73.44521900594125
2010	79.37772432658768
2011	84.06935342113545
2012	87.94227319488866
2013	93.34511569981031
2014	96.5611569660712
2015	98.65629471349705
2016	100
2017	101.78355010971296
2018	104.09713608491629
2019	104.97564106313651
2020	104.23223998579066
2021	106.5291078855989
2022	109.29943339769616
2023	111.242897385634