Year	Number
2004-01-01	22
2005-01-01	22
2006-01-01	22
2007-01-01	22
2008-01-01	22
2009-01-01	22
2010-01-01	21
2011-01-01	21
2012-01-01	21
2013-01-01	21
2014-01-01	21
2015-01-01	21
2016-01-01	26
2017-01-01	26