Year	Number
2005-01-01	28
2006-01-01	27
2007-01-01	25
2008-01-01	22
2009-01-01	21
2010-01-01	20
2011-01-01	22
2012-01-01	21
2013-01-01	20
2014-01-01	19
2015-01-01	17