Year	Number
2008-01-01	26.1499660656825
2009-01-01	29.2157307358783
2010-01-01	30.3877653012956
2011-01-01	27.2278234314215
2012-01-01	30.4343504486603
2013-01-01	26.2794916677199
2014-01-01	30.8200386325939
2015-01-01	29.6297103430843