Year	base year varies by country
1970	4.060344233287894
1971	4.727796634536483
1972	5.174624006548673
1973	6.621455729229893
1974	18.67504111291041
1975	18.378075369142273
1976	22.354312200895247
1977	26.53382116046136
1978	26.734277491704805
1979	34.37520188574618
1980	46.7797071339299
1981	51.0514750169777
1982	48.08211303195626
1983	41.6965546755414
1984	41.299663327014144
1985	38.725898105770256
1986	30.190402386145614
1987	32.526264290222784
1988	34.04981208934535
1989	34.4427466696806
1990	37.78463979487446
1991	35.93366841339219
1992	35.852543513603045
1993	34.00766034117386
1994	34.552700884010044
1995	37.23647748335486
1996	39.715517392081644
1997	38.09553163706611
1998	31.092745684221523
1999	36.03010834740982
2000	47.79560147961241
2001	45.42879150752236
2002	46.79574619470196
2003	54.83360244278255
2004	62.02052473780619
2005	80.96326743094392
2006	87.73310295922413
2007	97.3573020497945
2008	119.65170041134654
2009	90.6743309051512
2010	97.00279158811865
2011	114.72536781821468
2012	121.98744027570578
2013	122.92367993901905
2014	121.10102776792996
2015	90.66857261418032
2016	82.52952771085778
2017	88.95657216814836
2018	100
2019	95.54408579469548
2020	81.11652725308151
2021	99.34018421641935
2022	125.05012387068011