Year	Number
2004-01-01	0.2335
2005-01-01	0.2723
2006-01-01	0.3129
2007-01-01	0.3305
2008-01-01	0.3591
2009-01-01	0.4034
2010-01-01	0.5142
2011-01-01	0.5686
2012-01-01	0.6074
2013-01-01	0.7348
2014-01-01	0.9850
2015-01-01	1.0246