Year	Number
2004-01-01	11.73032408
2005-01-01	13.90027668
2006-01-01	12.72476991
2007-01-01	10.28694585
2008-01-01	13.19858554
2009-01-01	14.55529463
2010-01-01	16.65543135
2011-01-01	18.85176830
2012-01-01	20.38697648
2013-01-01	15.97550394