Year	Number
2004-01-01	24
2005-01-01	22
2006-01-01	19
2007-01-01	19
2008-01-01	19
2009-01-01	19
2010-01-01	19
2011-01-01	23
2012-01-01	34
2013-01-01	100
2014-01-01	126
2015-01-01	158
2016-01-01	136