Year	Number
2005-01-01	2
2006-01-01	2
2007-01-01	7
2008-01-01	16
2009-01-01	17
2010-01-01	16
2011-01-01	34
2012-01-01	34
2013-01-01	37
2014-01-01	39
2015-01-01	39
2016-01-01	47