Year	Number
2004-01-01	5.8787
2005-01-01	5.9392
2006-01-01	5.9559
2007-01-01	5.8063
2008-01-01	5.7973
2009-01-01	5.6421
2010-01-01	5.6316
2011-01-01	6.2955
2012-01-01	6.1393
2013-01-01	5.8621
2014-01-01	5.7235
2015-01-01	6.5658
2016-01-01	5.9463