Year	Number
2004-01-01	7.7159
2005-01-01	8.3345
2006-01-01	9.2564
2007-01-01	10.0119
2008-01-01	10.7440
2009-01-01	11.3625
2010-01-01	11.6992
2011-01-01	12.1376
2012-01-01	12.6055
2013-01-01	13.1437
2014-01-01	13.7114
2015-01-01	13.8210
2016-01-01	13.7329