Year	Number
2004-01-01	74
2005-01-01	87
2006-01-01	104
2007-01-01	147
2008-01-01	161
2009-01-01	164
2010-01-01	166
2011-01-01	174
2012-01-01	181
2013-01-01	186
2014-01-01	198
2015-01-01	203
2016-01-01	207
2017-01-01	220