Year	Number
2004-01-01	0.0031
2005-01-01	0.0123
2006-01-01	0.0245
2007-01-01	0.0444
2008-01-01	0.0659
2009-01-01	0.1011
2010-01-01	0.1225
2011-01-01	0.1486
2012-01-01	0.1608
2013-01-01	0.1869
2014-01-01	0.2083
2015-01-01	0.2665
2016-01-01	0.3201
2017-01-01	0.3799