Year	Number
2004-01-01	132
2005-01-01	133
2006-01-01	131
2007-01-01	133
2008-01-01	133
2009-01-01	131
2010-01-01	140
2011-01-01	148
2012-01-01	159
2013-01-01	173
2014-01-01	187
2015-01-01	238