Year	Number
2004-01-01	163
2005-01-01	166
2006-01-01	172
2007-01-01	180
2008-01-01	194
2009-01-01	204
2010-01-01	226
2011-01-01	477
2012-01-01	506
2013-01-01	549
2014-01-01	402
2015-01-01	413