Year	Number
2004-01-01	114
2005-01-01	150
2006-01-01	139
2007-01-01	137
2008-01-01	132
2009-01-01	177
2010-01-01	182
2011-01-01	195
2012-01-01	212
2013-01-01	263
2014-01-01	378
2015-01-01	450
2016-01-01	518