Year	Number
2004-01-01	164
2005-01-01	167
2006-01-01	169
2007-01-01	166
2008-01-01	167
2009-01-01	170
2010-01-01	148
2011-01-01	161
2012-01-01	171
2013-01-01	174
2014-01-01	177
2015-01-01	180