Year	Number
2004-01-01	37
2005-01-01	44
2006-01-01	60
2007-01-01	85
2008-01-01	109
2009-01-01	122
2010-01-01	141
2011-01-01	151
2012-01-01	162
2013-01-01	163
2014-01-01	171
2015-01-01	169
2016-01-01	171