Year	Number
2004-01-01	169
2005-01-01	189
2006-01-01	205
2007-01-01	220
2008-01-01	228
2009-01-01	237
2010-01-01	234
2011-01-01	231
2012-01-01	231
2013-01-01	235
2014-01-01	239
2015-01-01	239