Year	Number
2004-01-01	12.7813
2005-01-01	13.7074
2006-01-01	14.5564
2007-01-01	15.4022
2008-01-01	15.4940
2009-01-01	15.8474
2010-01-01	15.6806
2011-01-01	15.7936
2012-01-01	14.5560
2013-01-01	14.9893
2014-01-01	14.8439
2015-01-01	14.3556
2016-01-01	14.2705
2017-01-01	14.5203