Year	Number
2004-01-01	48
2005-01-01	49
2006-01-01	55
2007-01-01	56
2008-01-01	60
2009-01-01	59
2010-01-01	61
2011-01-01	62
2012-01-01	66
2013-01-01	65
2014-01-01	68
2015-01-01	67
2016-01-01	68
2017-01-01	70