Year	Number
2004-01-01	0.3158
2005-01-01	0.3158
2006-01-01	0.3158
2007-01-01	0.3599
2008-01-01	0.4262
2009-01-01	0.4703
2010-01-01	0.5322
2011-01-01	0.6823
2012-01-01	0.6956
2013-01-01	0.7751
2014-01-01	0.8192
2015-01-01	0.8325