Year	Number
2004-01-01	54
2005-01-01	50
2006-01-01	51
2007-01-01	53
2008-01-01	59
2009-01-01	59
2010-01-01	58
2011-01-01	60
2012-01-01	61
2013-01-01	59
2014-01-01	59
2015-01-01	59
2016-01-01	58
2017-01-01	57