Year	Number
2004-01-01	217
2005-01-01	257
2006-01-01	307
2007-01-01	299
2008-01-01	279
2009-01-01	280
2010-01-01	271
2011-01-01	274
2012-01-01	253
2013-01-01	230
2014-01-01	266
2015-01-01	265
2016-01-01	244
2017-01-01	251