Year	Number
2004-01-01	379677
2005-01-01	373067
2006-01-01	308753
2007-01-01	357306
2008-01-01	367595
2009-01-01	461018
2010-01-01	474680
2011-01-01	480605
2012-01-01	529214
2013-01-01	543086
2014-01-01	537343
2015-01-01	522144
2016-01-01	509269
2017-01-01	502614