Year	base year varies by country
1960	0.0708547760549382
1961	0.08072910863644837
1962	0.2251266337723877
1963	0.5534537619336761
1964	1.1884376792594076
1965	3.9078081885550704
1966	0.05065178491874741
1967	0.13408633736473538
1968	0.2989760695376234
1969	0.3628170333776953
1970	0.41452960592308213
1971	0.42582444791022417
1972	0.49446666347851664
1973	0.6768184506499896
1974	1.0007476635514019
1975	1.1188053097345134
1976	1.2782396694214877
1977	1.4511984732824428
1978	1.6247142857142856
1979	2.1350266666666666
1980	2.754284848484849
1981	3.035224719101124
1982	3.2765164835164833
1983	3.8788210526315785
1984	4.288413793103448
1985	4.553884615384615
1986	4.661177272727272
1987	5.403329004329004
1988	5.823967213114754
1989	6.356832699619772
1990	6.936070921985815
1991	7.553779612721495
1992	8.104363750581454
1993	9.656558360185175
1994	10.407507651285648
1995	11.435982254344234
1996	12.428226370213222
1997	13.990625474075543
1998	24.521532787348686
1999	27.9940751039258
2000	33.71815153171446
2001	38.53840252482259
2002	40.81064666017974
2003	43.05010197551999
2004	46.73119868241973
2005	53.42861458012895
2006	60.955330275947496
2007	67.81803400322926
2008	80.12683847748623
2009	86.75713599306388
2010	100
2011	107.46594303367513
2012	111.50008423618154
2013	117.03716759416032
2014	123.40770491393293
2015	128.3196310308165
2016	131.4492494202253
2017	137.09194259161427
2018	142.32655654738392
2019	144.60163018601418
2020	144.02083566302198
2021	152.6678080694117
2022	167.27305918092478
2023	169.83747841382782