Year	base year varies by country
1960	0.09990069738928053
1961	0.09385137040228288
1962	0.09871903154971488
1963	0.10133685534983759
1964	0.09959266865767334
1965	0.0989241189398386
1966	0.10092965412963084
1967	0.10419378471179168
1968	0.10831504902604328
1969	0.11380341492777529
1970	0.12039619823214143
1971	0.1297440344451092
1972	0.13920193917007923
1973	0.16189055587843998
1974	0.21531045995878492
1975	0.25522244702039143
1976	0.2858844075905159
1977	0.3172420342770885
1978	0.3496535692818179
1979	0.3934491701974448
1980	0.4716519413688757
1981	0.7082844958089182
1982	1.247396363728718
1983	1.6088064103589834
1984	1.8707839669528863
1985	2.226528920402502
1986	2.5018833754905483
1987	2.9300684571267177
1988	3.4896731184684464
1989	4.125054496290867
1990	4.996801200557859
1991	8.354653441558462
1992	9.91533780499268
1993	10.896281885188483
1994	12.450713042068713
1995	15.084915056968892
1996	17.601790907536554
1997	19.802928651206358
1998	21.939041482514252
1999	24.84200795361774
2000	27.429612599188502
2001	30.065126285948867
2002	33.26200213065062
2003	36.96394383638445
2004	42.328073436390724
2005	48.32998220794311
2006	55.07040809338166
2007	61.40338198801668
2008	69.4570942673875
2009	74.47594431468403
2010	78.13945960776849
2011	82.19645249555857
2012	85.47366585404748
2013	89.11585379176655
2014	94.2140487623642
2015	95.83792518170767
2016	96.74559081954159
2017	99.99999999916746
2018	102.78408230631175
2019	105.16837405155668
2020	105.74006544959687
2021	109.9185714627179
2022	119.94435566107016
2023	118.57107181682763