Year	Number
2004-01-01	26
2005-01-01	28
2006-01-01	28
2007-01-01	28
2008-01-01	28
2009-01-01	28
2010-01-01	28
2011-01-01	30
2012-01-01	36
2013-01-01	44
2014-01-01	44
2015-01-01	45
2016-01-01	45