Year	Number
2005-01-01	0.1785
2006-01-01	0.1979
2007-01-01	0.2212
2008-01-01	0.2367
2009-01-01	0.2833
2010-01-01	0.3532
2011-01-01	0.4191
2012-01-01	0.5045
2013-01-01	0.5744