Year	Number
2004-01-01	164
2005-01-01	199
2006-01-01	239
2007-01-01	304
2008-01-01	396
2009-01-01	461
2010-01-01	510
2011-01-01	568
2012-01-01	617
2013-01-01	659
2014-01-01	696
2015-01-01	601