Year	Number
2004-01-01	29
2005-01-01	29
2006-01-01	29
2007-01-01	30
2008-01-01	30
2009-01-01	31
2010-01-01	33
2011-01-01	33
2012-01-01	33
2013-01-01	39
2014-01-01	40
2015-01-01	35
2016-01-01	37