Year	Number
2004-01-01	0.2531
2005-01-01	0.2925
2006-01-01	0.3052
2007-01-01	0.3637
2008-01-01	0.3955
2009-01-01	0.4654
2010-01-01	0.5494
2011-01-01	0.6040
2012-01-01	0.6613
2013-01-01	0.6841
2014-01-01	0.7503
2015-01-01	0.8050
2016-01-01	0.8456
2017-01-01	0.8622