Year	base year varies by country
1970	7.451155113173638
1971	8.447019641165978
1972	8.96582220341091
1973	9.542624985648548
1974	10.725733667074463
1975	12.506265339859135
1976	14.771728811631423
1977	17.007414749866097
1978	19.01396402857462
1979	22.13042758599158
1980	26.048448158517907
1981	30.603231992231635
1982	34.98225682002289
1983	37.02188848429188
1984	40.42354008837397
1985	46.37516670061553
1986	52.5784868549406
1987	57.502459336508615
1988	60.20825372392731
1989	63.02894255800639
1990	64.91133079529772
1991	66.04232865223756
1992	67.2013671186469
1993	68.02068443376997
1994	69.0145963271028
1995	70.68724510630263
1996	71.70237686728062
1997	72.69369488666995
1998	73.35675053252322
1999	74.45316554754078
2000	76.20951405613819
2001	77.98196196410034
2002	78.61401446126976
2003	79.02839006531576
2004	80.86801986435587
2005	82.71181094277374
2006	85.4798812373866
2007	87.28224052829836
2008	90.39525193228884
2009	92.48469049331595
2010	93.81814309238592
2011	95.32280930976742
2012	96.13135960545502
2013	97.70819284058668
2014	98.34609582389847
2015	100
2016	101.61396294508343
2017	103.1829785489103
2018	105.29491078883879
2019	107.79247180055103
2020	109.28091591588019
2021	114.74121793648415
2022	122.97491092581649