Year	Number
2004-01-01	413
2005-01-01	402
2006-01-01	401
2007-01-01	411
2008-01-01	417
2009-01-01	452
2010-01-01	548
2011-01-01	583
2012-01-01	606
2013-01-01	645
2014-01-01	674
2015-01-01	723