Year	Number
2004-01-01	0.4506
2005-01-01	0.4815
2006-01-01	0.5458
2007-01-01	0.6418
2008-01-01	0.7055
2009-01-01	0.6817
2010-01-01	0.6978
2011-01-01	0.8522
2012-01-01	0.8986
2013-01-01	0.9449
2014-01-01	0.9655
2015-01-01	0.9629
2016-01-01	0.9694