Year	Number
2004-01-01	55
2005-01-01	59
2006-01-01	63
2007-01-01	66
2008-01-01	72
2009-01-01	71
2010-01-01	73
2011-01-01	70
2012-01-01	70
2013-01-01	72
2014-01-01	61
2015-01-01	59
2016-01-01	59