Year	Number
2004-01-01	0.3555
2005-01-01	0.3622
2006-01-01	0.4025
2007-01-01	0.4595
2008-01-01	0.5031
2009-01-01	0.5433
2010-01-01	0.5333
2011-01-01	0.5567
2012-01-01	0.5500
2013-01-01	0.5165
2014-01-01	0.4796
2015-01-01	0.4930
2016-01-01	0.5165