Year	Number
2004-01-01	24
2005-01-01	27
2006-01-01	27
2007-01-01	28
2008-01-01	28
2009-01-01	27
2010-01-01	29
2011-01-01	28
2012-01-01	29
2013-01-01	29
2014-01-01	29
2015-01-01	29
2016-01-01	29