Year	Number
2004-01-01	0.0213
2005-01-01	0.0276
2006-01-01	0.0268
2007-01-01	0.0387
2008-01-01	0.0489
2009-01-01	0.0497
2010-01-01	0.0608
2011-01-01	0.0726
2012-01-01	0.0892
2013-01-01	0.1058
2014-01-01	0.1105
2015-01-01	0.1255
2016-01-01	0.1318