Year	Number
2004-01-01	32
2005-01-01	33
2006-01-01	34
2007-01-01	35
2008-01-01	35
2009-01-01	34
2010-01-01	34
2011-01-01	33
2012-01-01	33
2013-01-01	35
2014-01-01	32
2015-01-01	32
2016-01-01	34