Year	Number
2004-01-01	253
2005-01-01	246
2006-01-01	234
2007-01-01	229
2008-01-01	229
2009-01-01	225
2010-01-01	225
2011-01-01	226
2012-01-01	223
2013-01-01	222
2014-01-01	221
2015-01-01	223
2016-01-01	230
2017-01-01	217