Year	Number
2004-01-01	2.906223782
2005-01-01	2.061793678
2006-01-01	2.323962481
2007-01-01	2.019125014
2008-01-01	5.083650947
2009-01-01	5.006793851
2010-01-01	8.194188608
2011-01-01	9.013559166
2012-01-01	8.922276518
2013-01-01	10.786661930
2014-01-01	11.335785850