Year	base year varies by country
1992	11.9841425659438
1993	11.8183814260312
1994	14.4361529118971
1995	16.0674381909415
1996	17.5255316776271
1997	18.208528249303
1998	19.867174577182
1999	20.3278072365198
2000	25.4052045502586
2001	29.2356157273169
2002	33.9567780622853
2003	41.3840903943259
2004	51.6470491965951
2005	55.5844597903212
2006	61.9177553363434
2007	66.4304502955943
2008	77.1099556957934
2009	99.8608680813897
2010	83.6552469878995
2011	100