Year	Number
2005-01-01	2.7939
2006-01-01	2.8828
2007-01-01	3.0695
2008-01-01	3.2506
2009-01-01	3.3513
2010-01-01	3.4535
2011-01-01	3.5737
2012-01-01	3.6840
2013-01-01	3.7876
2014-01-01	3.9144
2015-01-01	4.0031
2016-01-01	3.9558
2017-01-01	4.2354