Year	Number
2006-01-01	0.0947
2007-01-01	0.1117
2008-01-01	0.1042
2009-01-01	0.1004
2010-01-01	0.1496
2011-01-01	0.1705
2012-01-01	0.1989
2013-01-01	0.2330
2014-01-01	0.2538
2015-01-01	0.2065