Year	Number
2004-01-01	0.0726
2005-01-01	0.1130
2006-01-01	0.1789
2007-01-01	0.2502
2008-01-01	0.3968
2009-01-01	0.5798
2010-01-01	0.6578
2011-01-01	0.7008
2012-01-01	0.8650
2013-01-01	1.0008
2014-01-01	1.1609
2015-01-01	1.2941
2016-01-01	1.3667