Year	Number
2004-01-01	26
2005-01-01	25
2006-01-01	28
2007-01-01	28
2008-01-01	29
2009-01-01	28
2010-01-01	30
2011-01-01	27
2012-01-01	27
2013-01-01	25
2014-01-01	30
2015-01-01	35
2016-01-01	34
2017-01-01	35