Year	Number
2004-01-01	48
2005-01-01	48
2006-01-01	48
2007-01-01	48
2008-01-01	45
2009-01-01	29
2010-01-01	29
2011-01-01	29
2012-01-01	29
2013-01-01	28
2014-01-01	28
2015-01-01	28
2016-01-01	28
2017-01-01	29