Year	Number
2008-01-01	3.3798
2009-01-01	3.9835
2010-01-01	3.8023
2011-01-01	3.6660
2012-01-01	4.1375
2013-01-01	3.7691
2014-01-01	3.0250
2015-01-01	2.9587
2016-01-01	3.0520
2017-01-01	3.2951