Year	Number
2004-01-01	0.4543
2005-01-01	0.4656
2006-01-01	0.4996
2007-01-01	0.5231
2008-01-01	0.5530
2009-01-01	0.5567
2010-01-01	0.5555
2011-01-01	0.5786
2012-01-01	0.5933
2013-01-01	0.6021
2014-01-01	0.6109
2015-01-01	0.6252
2016-01-01	0.6336