Year	Number
2004-01-01	103
2005-01-01	100
2006-01-01	94
2007-01-01	82
2008-01-01	89
2009-01-01	137
2010-01-01	147
2011-01-01	154
2012-01-01	159
2013-01-01	164
2014-01-01	157
2015-01-01	166
2016-01-01	161