Year	Number
2004-01-01	4.2550
2005-01-01	4.2745
2006-01-01	4.3501
2007-01-01	4.3598
2008-01-01	4.4768
2009-01-01	4.3403
2010-01-01	4.2940
2011-01-01	4.1721
2012-01-01	4.2495
2013-01-01	4.2225
2014-01-01	4.1664
2015-01-01	3.8447
2016-01-01	3.5305
2017-01-01	3.2948