Year	Number
2004-01-01	0.0973
2005-01-01	0.2094
2006-01-01	0.2327
2007-01-01	0.2496
2008-01-01	0.2771
2009-01-01	0.3067
2010-01-01	0.4083
2011-01-01	0.4316
2012-01-01	0.4696
2013-01-01	0.5162
2014-01-01	0.5373