Year	Months
2007-01-01	2.697584461
2008-01-01	3.633677429
2009-01-01	1.410255133
2010-01-01	1.299254196
2011-01-01	1.882238691
2012-01-01	2.477528861
2013-01-01	2.307680320
2014-01-01	2.507233638
2015-01-01	2.329983113
2016-01-01	1.880820847