Year	Number
2004-01-01	12.1884
2005-01-01	11.9114
2006-01-01	12.0037
2007-01-01	12.0960
2008-01-01	12.5577
2009-01-01	12.0960
2010-01-01	11.6343
2011-01-01	11.5420
2012-01-01	11.5420
2013-01-01	11.0803
2014-01-01	10.1570
2015-01-01	10.4340
2016-01-01	10.4340