Year	base year varies by country
1960	0.03230518815478446
1961	0.034326578423149595
1962	0.0362369558011252
1963	0.03511551172350662
1964	0.03596804927216179
1965	0.03627897325892236
1966	0.041065211578560974
1967	0.03983050164682709
1968	0.04031665162757672
1969	0.04140774399019404
1970	0.06264100626203221
1971	0.0634854284805946
1972	0.06532197819290778
1973	0.06881463760733104
1974	0.09905617143509504
1975	0.12233515452556573
1976	0.13989414602485947
1977	0.15488206039158992
1978	0.1764335041782807
1979	0.19670353158119358
1980	0.22113344582116182
1981	0.7054219811990051
1982	0.8098424361898093
1983	0.9683200966990638
1984	1.0230656623280547
1985	1.0939412897252556
1986	1.1531831615702184
1987	1.38000824214106
1988	1.6584542456052687
1989	2.138903023922928
1990	2.281545223241062
1991	2.71193378778681
1992	3.9798267093310904
1993	5.6369890897773
1994	8.077606058270526
1995	14.168254564360744
1996	17.92157961209645
1997	18.8275774577984
1998	19.958991411266496
1999	22.639598050396028
2000	27.772841060957205
2001	30.571365070716844
2002	37.02468981007237
2003	40.65471027635552
2004	49.74849469657855
2005	59.62779691442661
2006	73.85760162744651
2007	79.1012926611945
2008	85.36721233496326
2009	85.95291581806572
2010	100
2011	109.77845809675884
2012	120.69882029005731
2013	126.69120979920305
2014	132.5983431815443
2015	136.395515688896
2016	149.41265368850574
2017	166.02572425592922
2018	183.007640701348
2019	202.01258009855914
2020	217.86883446372062
2021	239.9411994761364
2022	267.0817522112908
2023	300.7924617060529