Year	Number
2004-01-01	0.4035
2005-01-01	0.7397
2006-01-01	0.7397
2007-01-01	0.7397
2008-01-01	0.7397
2009-01-01	0.7397
2010-01-01	0.7397
2011-01-01	1.6812
2012-01-01	1.8830
2013-01-01	2.2192
2014-01-01	2.3537
2015-01-01	2.4210
2016-01-01	2.4210
2017-01-01	2.6227