Year	Number
2005-01-01	19
2006-01-01	18
2007-01-01	16
2008-01-01	13
2009-01-01	13
2010-01-01	11
2011-01-01	14
2012-01-01	14
2013-01-01	13
2014-01-01	12
2015-01-01	11