Year	Number
2004-01-01	124
2005-01-01	141
2006-01-01	108
2007-01-01	104
2008-01-01	102
2009-01-01	109
2010-01-01	115
2011-01-01	144
2012-01-01	165
2013-01-01	249
2014-01-01	431
2015-01-01	497