Year	Number
2004-01-01	6.5823
2005-01-01	6.8577
2006-01-01	6.8626
2007-01-01	7.5182
2008-01-01	7.8861
2009-01-01	8.0884
2010-01-01	8.1664
2011-01-01	8.6904
2012-01-01	8.3861
2013-01-01	7.9467
2014-01-01	7.9325
2015-01-01	8.0651
2016-01-01	6.9971