Year	Number
2004-01-01	11.5524
2005-01-01	11.1528
2006-01-01	10.9954
2007-01-01	10.9351
2008-01-01	10.7535
2009-01-01	10.1117
2010-01-01	9.7492
2011-01-01	13.1176
2012-01-01	13.9666
2013-01-01	13.6918
2014-01-01	13.1842
2015-01-01	12.4087
2016-01-01	11.4998
2017-01-01	11.0272