Year	base year varies by country
1979	30.148622142754395
1980	34.343099012366174
1981	39.728859380590784
1982	42.94569412498538
1983	44.147144533171854
1984	49.51818464407833
1985	47.80973224361386
1986	46.38857495119696
1987	54.03117725894053
1988	59.32410131305159
1989	63.14971202431009
1990	62.53835690107874
1991	68.95970066858861
1992	70.88104278154803
1993	72.3430776079537
1994	74.014419806829
1995	75.2963042775563
1996	76.86637885648099
1997	79.30844123256048
1998	82.95181171101908
1999	85.505598536718
2000	87.36874037429412
2001	90.53577467510507
2002	93.13815420679813
2003	93.88208849471035
2004	95.86945795446536
2005	96.27167049688748
2006	100
2007	105.7769601471735
2008	113.35542510888091
2009	116.25133237769691
2010	117.96221347029892
2011	121.24971405444403
2012	120.68707210424543
2013	124.31635714161855
2014	126.04660546756783
2015	133.43775127311713
2016	135.54204336346908
2017	142.81263639510559
2018	147.39213105163083
2019	152.22565381237072
2020	156.46565864423968
2021	157.56047318277518
2022	175.24745117855124
2023	195.06797528171575