Year	Number
2004-01-01	5.9686
2005-01-01	5.9795
2006-01-01	6.1602
2007-01-01	6.2205
2008-01-01	6.2506
2009-01-01	6.1685
2010-01-01	6.0042
2011-01-01	6.0069
2012-01-01	5.9056
2013-01-01	5.7386
2014-01-01	5.5661
2015-01-01	5.3389
2016-01-01	4.5969