Year	Number
2004-01-01	50
2005-01-01	66
2006-01-01	65
2007-01-01	66
2008-01-01	68
2009-01-01	68
2010-01-01	69
2011-01-01	70
2012-01-01	70
2013-01-01	76
2014-01-01	76
2015-01-01	79
2016-01-01	80