Year	Number
2005-01-01	5
2006-01-01	9
2007-01-01	11
2008-01-01	22
2009-01-01	22
2010-01-01	19
2011-01-01	17
2012-01-01	31
2013-01-01	39
2014-01-01	46
2015-01-01	47