Year	Number
2004-01-01	1.8851
2005-01-01	1.9290
2006-01-01	1.8413
2007-01-01	2.1482
2008-01-01	2.2797
2009-01-01	2.2797
2010-01-01	2.2797
2011-01-01	2.2797
2012-01-01	2.2797
2013-01-01	2.4112
2014-01-01	2.4112
2015-01-01	2.2359
2016-01-01	2.2359