Year	Number
2004-01-01	1.8440
2005-01-01	1.8214
2006-01-01	1.7227
2007-01-01	1.7274
2008-01-01	1.6828
2009-01-01	1.5919
2010-01-01	1.6406
2011-01-01	1.7532
2012-01-01	1.7498
2013-01-01	1.7448
2014-01-01	1.6982
2015-01-01	2.6495