Year	Number
2005-01-01	2.9731
2006-01-01	3.0081
2007-01-01	3.0704
2008-01-01	3.2303
2009-01-01	3.2663
2010-01-01	3.2289
2011-01-01	3.3802
2012-01-01	3.6653
2013-01-01	3.7583
2014-01-01	3.9687
2015-01-01	3.9570
2016-01-01	3.9465
2017-01-01	3.7661