Year	Number
2004-01-01	50
2005-01-01	101
2006-01-01	100
2007-01-01	109
2008-01-01	131
2009-01-01	203
2010-01-01	238
2011-01-01	316
2012-01-01	369
2013-01-01	411
2014-01-01	449
2015-01-01	479