Year	Number
2004-01-01	7
2005-01-01	11
2006-01-01	12
2007-01-01	10
2008-01-01	10
2009-01-01	15
2010-01-01	13
2011-01-01	13
2012-01-01	11
2013-01-01	11
2014-01-01	11
2015-01-01	11
2016-01-01	12
2017-01-01	11