Year	Number
2004-01-01	178
2005-01-01	171
2006-01-01	159
2007-01-01	157
2008-01-01	152
2009-01-01	131
2010-01-01	129
2011-01-01	117
2012-01-01	107
2013-01-01	99
2014-01-01	93
2015-01-01	88
2016-01-01	86
2017-01-01	87