Year	Number
2004-01-01	0.0151
2005-01-01	0.0151
2006-01-01	0.0151
2007-01-01	0.0159
2008-01-01	0.0222
2009-01-01	0.0262
2010-01-01	0.0302
2011-01-01	0.0341
2012-01-01	0.0341
2013-01-01	0.0461
2014-01-01	0.0548
2015-01-01	0.0580
2016-01-01	0.0611
2017-01-01	0.0627