Year	base year varies by country
1960	0.1783248670064034
1961	0.18191584935240476
1962	0.18312568823704098
1963	0.19213516038155085
1964	0.19143097952729551
1965	0.19557968863084413
1966	0.20075262828911383
1967	0.20563940261014968
1968	0.20782966588956797
1969	0.2115279153595107
1970	0.22074685860672144
1971	0.23892019162034078
1972	0.25389756520854817
1973	0.282335094112289
1974	0.42380747496636223
1975	0.4333982302821191
1976	0.4602409417742952
1977	0.49912406301001977
1978	0.5295041242110311
1979	0.6457068714476187
1980	0.8266806830226172
1981	0.9308951575216307
1982	0.970779392955982
1983	1.0060697147449558
1984	1.43416502058432
1985	1.5836080394189909
1986	1.5649717719814642
1987	2.1509680129753446
1988	2.5488467621504713
1989	4.82147815078182
1990	6.833994814164586
1991	8.299860488473064
1992	10.644078260367046
1993	14.012484549316696
1994	22.825032009663833
1995	34.63924617115422
1996	74.65613760461169
1997	100
1998	118.89028670257159
1999	150.0308747899282
2000	194.2192059535429
2001	209.75072951237013
2002	279.0164529932774
2003	376.4873791528367
2004	504.3188660397645
2005	653.6177224619677
2006	770.643501976161
2007	889.6961919721658
2008	1157.7834775569868
2009	1248.457216690764
2010	1822.0392703419307
2011	2334.92858378704
2012	2663.2062350756046
2013	3608.7156795690967
2014	5068.097986938929