Year	Months
2004-01-01	1.56074425118472
2005-01-01	1.38929038891038
2006-01-01	1.88668723782437
2007-01-01	3.63491757371774
2008-01-01	4.01364495041491
2009-01-01	4.01447461441837
2010-01-01	4.03818731093416
2011-01-01	3.16800225895778
2012-01-01	4.15826570184061
2013-01-01	4.70049535618373
2014-01-01	5.24848504919073
2015-01-01	4.22240652856689
2016-01-01	3.60859265104919
2017-01-01	3.39665610241074
2018-01-01	2.77051091753831
2019-01-01	2.67652035775238