Year	Number
2004-01-01	68
2005-01-01	78
2006-01-01	80
2007-01-01	85
2008-01-01	90
2009-01-01	95
2010-01-01	94
2011-01-01	83
2012-01-01	80
2013-01-01	75
2014-01-01	75
2015-01-01	72
2016-01-01	65
2017-01-01	68