Year	base year varies by country
1980	33.23462138564103
1981	41.025198005981736
1982	37.64903762249293
1983	40.11938979282987
1984	44.2594240958258
1985	48.12171892829085
1986	49.28064546081242
1987	50.03722093208805
1988	50.365634376125435
1989	52.83150611855061
1990	55.61240786785601
1991	56.259139962211314
1992	61.54005341180907
1993	63.07082769707423
1994	63.7905957626673
1995	66.22479866057267
1996	68.99952924417939
1997	74.3549699879011
1998	74.97258931892367
1999	73.83339900704266
2000	74.97651267233225
2001	74.31247203581206
2002	75.79024711175508
2003	77.44407565111912
2004	80.57835910846582
2005	83.37959022330566
2006	86.54083390270647
2007	89.2292965476502
2008	92.31295230951731
2009	92.0775531070001
2010	94.03548135558145
2011	95.71780112698629
2012	96.3025943703019
2013	99.25417731242452
2014	100
2015	98.3348170601883
2016	98.72948123350882
2017	99.85774535320456
2018	100.93134363031382
2019	100.78038783406107
2020	100.58151977970964
2021	103.97710882894148
2022	112.18914719492517
2023	118.77041306436121