Year	Number
2004-01-01	46
2005-01-01	48
2006-01-01	46
2007-01-01	54
2008-01-01	50
2009-01-01	46
2010-01-01	48
2011-01-01	54
2012-01-01	52
2013-01-01	50
2014-01-01	54
2015-01-01	50
2016-01-01	51