Year	Number
2004-01-01	0.0720
2005-01-01	0.1195
2006-01-01	0.1945
2007-01-01	0.2665
2008-01-01	0.3247
2009-01-01	0.5009
2010-01-01	0.5530
2011-01-01	0.5346
2012-01-01	0.5392
2013-01-01	0.5974
2014-01-01	0.6403
2015-01-01	0.6280
2016-01-01	0.6372
2017-01-01	0.6372