Year	Number
2004-01-01	0.6428
2005-01-01	0.6524
2006-01-01	0.6769
2007-01-01	0.6921
2008-01-01	0.7050
2009-01-01	0.7127
2010-01-01	0.7141
2011-01-01	0.7161
2012-01-01	0.7417
2013-01-01	0.7356
2014-01-01	0.7228
2015-01-01	0.7230
2016-01-01	0.7080