Year	base year varies by country
1960	2.9171370676238646
1961	2.90064264611765
1962	2.820940213911939
1963	3.455685390770132
1964	3.5287878895608635
1965	3.424616197624967
1966	3.6845758334428798
1967	3.7191272601622978
1968	3.879927289553516
1969	3.7567276932803186
1970	3.7903491023004077
1971	4.099350283931038
1972	3.756885384054814
1973	4.484066353814253
1974	5.7276604973973395
1975	6.3990679611650485
1976	6.84298362388914
1977	7.613220336116928
1978	8.302849305938297
1979	9.902962452897787
1980	11.37672331729009
1981	13.545315450559814
1982	13.781000138234722
1983	14.35015947667372
1984	15.966922602535059
1985	16.12931358602753
1986	21.040741130645333
1987	26.444692922516253
1988	32.64423439657638
1989	42.44530056243701
1990	52.55686047149337
1991	56.68004999190451
1992	59.843896689044584
1993	62.7666126614846
1994	71.61022944658887
1995	75.4854548627453
1996	83.16314063017244
1997	85.45605008372887
1998	84.84272125608324
1999	91.1568835192621
2000	100
2001	106.55411843600844
2002	106.97407413643596
2003	105.44366000855987
2004	116.332163789945
2005	130.23437966029604
2006	142.08115824186496
2007	157.38196963631802
2008	182.48459205853675
2009	177.4111133867811
2010	189.65117640564836
2011	211.60155114100982
2012	267.13903436338103
2013	352.00962358867133
2014	482.5861292203287
2015	667.004236000145
2016	912.9356450541233
2017	1252.7388575175837
2018	1417.94930994931
2019	1699.1478572880278
2020	2529.2305573947233
2021	3750.5375613297106