Year	Number
2006-01-01	0.7272
2007-01-01	0.7394
2008-01-01	0.7480
2009-01-01	0.7455
2010-01-01	0.7513
2011-01-01	0.7634
2012-01-01	0.7767
2013-01-01	0.7824
2014-01-01	0.7853
2015-01-01	0.7825
2016-01-01	0.7708
2017-01-01	0.7281