Year	Number
2005-01-01	3.2663
2006-01-01	3.4953
2007-01-01	3.7583
2008-01-01	3.8479
2009-01-01	4.1630
2010-01-01	3.9726
2011-01-01	3.9374
2012-01-01	4.0361
2013-01-01	4.0848
2014-01-01	4.1177
2015-01-01	4.0383