Year	Number
2004-01-01	24.5614
2005-01-01	24.5614
2006-01-01	25.1462
2007-01-01	25.7310
2008-01-01	25.9259
2009-01-01	26.1209
2010-01-01	27.6803
2011-01-01	25.9259
2012-01-01	26.3158
2013-01-01	26.1209
2014-01-01	27.8752
2015-01-01	27.2904
2016-01-01	27.2904