Year	Number
2004-01-01	0.1978
2005-01-01	0.2040
2006-01-01	0.2501
2007-01-01	0.2575
2008-01-01	0.2609
2009-01-01	0.2688
2010-01-01	0.2802
2011-01-01	0.2819
2012-01-01	0.2887