Year	Number
2004-01-01	0.4590
2005-01-01	0.4548
2006-01-01	0.4513
2007-01-01	0.4788
2008-01-01	0.4730
2009-01-01	0.4846
2010-01-01	0.6014
2011-01-01	0.6109
2012-01-01	0.6917
2013-01-01	0.6486
2014-01-01	0.7945
2015-01-01	1.0297