Year	Number
2004-01-01	9.2993
2005-01-01	9.4953
2006-01-01	9.7298
2007-01-01	10.0900
2008-01-01	10.3809
2009-01-01	10.2755
2010-01-01	10.1958
2011-01-01	9.9304
2012-01-01	9.5960
2013-01-01	9.1482
2014-01-01	8.9542
2015-01-01	8.9063
2016-01-01	8.7123
2017-01-01	8.4924