Year	Number
2004-01-01	0.1444
2005-01-01	0.1853
2006-01-01	0.2896
2007-01-01	0.3441
2008-01-01	0.4291
2009-01-01	0.4989
2010-01-01	0.7355
2011-01-01	0.8599
2012-01-01	0.9609
2013-01-01	1.1182
2014-01-01	1.1631
2015-01-01	1.2345
2016-01-01	1.2609