Year	Number
2004-01-01	8.2111
2005-01-01	8.0073
2006-01-01	7.8027
2007-01-01	7.5412
2008-01-01	7.5767
2009-01-01	7.4958
2010-01-01	7.5559
2011-01-01	7.6704
2012-01-01	7.9481
2013-01-01	8.2557
2014-01-01	8.6352
2015-01-01	8.7910
2016-01-01	8.8727