Year	Number
2004-01-01	221
2005-01-01	225
2006-01-01	230
2007-01-01	351
2008-01-01	362
2009-01-01	347
2010-01-01	337
2011-01-01	324
2012-01-01	266
2013-01-01	280
2014-01-01	272
2015-01-01	267
2016-01-01	255
2017-01-01	252