Year	Number
2004-01-01	32
2005-01-01	23
2006-01-01	27
2007-01-01	27
2008-01-01	28
2009-01-01	30
2010-01-01	30
2011-01-01	17
2012-01-01	18
2013-01-01	21
2014-01-01	32
2015-01-01	34
2016-01-01	34
2017-01-01	31