Year	Number
2004-01-01	6.7100
2005-01-01	6.1663
2006-01-01	6.0067
2007-01-01	5.8551
2008-01-01	5.3749
2009-01-01	5.5725
2010-01-01	2.8788
2011-01-01	2.8095
2012-01-01	3.0434
2013-01-01	2.9655
2014-01-01	3.1784
2015-01-01	3.0975
2016-01-01	3.0182