Year	Number
2004-01-01	29
2005-01-01	31
2006-01-01	38
2007-01-01	43
2008-01-01	45
2009-01-01	49
2010-01-01	53
2011-01-01	53
2012-01-01	53
2013-01-01	54
2014-01-01	53
2015-01-01	53
2016-01-01	52