Year	Number
2004-01-01	13.9282
2005-01-01	13.3214
2006-01-01	13.0359
2007-01-01	12.8815
2008-01-01	12.5841
2009-01-01	11.7648
2010-01-01	11.2862
2011-01-01	15.0986
2012-01-01	15.9733
2013-01-01	15.5443
2014-01-01	14.8438
2015-01-01	13.8114
2016-01-01	12.6292
2017-01-01	12.1102