Year	Number
2005-01-01	122
2006-01-01	149
2007-01-01	159
2008-01-01	215
2009-01-01	270
2010-01-01	335
2011-01-01	362
2012-01-01	425
2013-01-01	531
2014-01-01	494
2015-01-01	548