Year	Number
2004-01-01	0.2308
2005-01-01	0.2372
2006-01-01	0.2372
2007-01-01	0.2436
2008-01-01	0.2436
2009-01-01	0.2500
2010-01-01	0.2692
2011-01-01	0.2692
2012-01-01	0.2692
2013-01-01	0.3077
2014-01-01	0.3141
2015-01-01	0.2821
2016-01-01	0.2949