Year	Number
2005-01-01	22
2006-01-01	26
2007-01-01	22
2008-01-01	22
2009-01-01	23
2010-01-01	7
2011-01-01	5
2012-01-01	5
2013-01-01	5
2014-01-01	5
2015-01-01	4