Year	Number
2004-01-01	167
2005-01-01	157
2006-01-01	157
2007-01-01	149
2008-01-01	144
2009-01-01	142
2010-01-01	142
2011-01-01	139
2012-01-01	137
2013-01-01	141
2014-01-01	141
2015-01-01	146
2016-01-01	138