Year	Number
2004-01-01	2.5774
2005-01-01	2.4552
2006-01-01	1.9980
2007-01-01	2.1309
2008-01-01	2.2601
2009-01-01	2.3041
2010-01-01	3.3595
2011-01-01	3.3796
2012-01-01	3.3195
2013-01-01	3.5552
2014-01-01	3.4910