Year	Number
2004-01-01	23
2005-01-01	24
2006-01-01	25
2007-01-01	26
2008-01-01	30
2009-01-01	29
2010-01-01	28
2011-01-01	33
2012-01-01	31
2013-01-01	31
2014-01-01	31
2015-01-01	33
2016-01-01	31