Year	Number
2006-01-01	5.4881
2007-01-01	5.4523
2008-01-01	5.4360
2009-01-01	5.4393
2010-01-01	5.4261
2011-01-01	5.4000
2012-01-01	5.3177
2013-01-01	5.4362
2014-01-01	5.3868
2015-01-01	5.0874
2016-01-01	4.7945
2017-01-01	4.9294