Year	Number
2004-01-01	20.8333
2005-01-01	18.0556
2006-01-01	18.0556
2007-01-01	19.4444
2008-01-01	20.8333
2009-01-01	19.4444
2010-01-01	19.4444
2011-01-01	19.4444
2012-01-01	18.0556
2013-01-01	19.4444
2014-01-01	16.6667
2015-01-01	27.7778