Year	Number
2004-01-01	0.0540
2005-01-01	0.0536
2006-01-01	0.0533
2007-01-01	0.0528
2008-01-01	0.0522
2009-01-01	0.0516
2010-01-01	0.0511
2011-01-01	0.0507
2012-01-01	0.0504
2013-01-01	0.0501
2014-01-01	0.0497
2015-01-01	0.0494
2016-01-01	0.0489
2017-01-01	0.0489