Year	Number
2004-01-01	0.5712
2005-01-01	0.5759
2006-01-01	0.6071
2007-01-01	0.6373
2008-01-01	0.6647
2009-01-01	0.7159
2010-01-01	0.7499
2011-01-01	0.7764
2012-01-01	0.7997
2013-01-01	0.8331
2014-01-01	0.9001
2015-01-01	0.9359
2016-01-01	0.9592