Year	Number
2004-01-01	1
2005-01-01	1
2006-01-01	1
2007-01-01	9
2008-01-01	19
2009-01-01	24
2010-01-01	30
2011-01-01	31
2012-01-01	33
2013-01-01	35
2014-01-01	35
2015-01-01	35
2016-01-01	35