Year	Months
2007-01-01	5.004689405
2008-01-01	7.474640003
2009-01-01	4.106292244
2010-01-01	3.370801909
2011-01-01	3.655859857
2012-01-01	6.163626447
2013-01-01	6.468205390
2014-01-01	6.220351997
2015-01-01	4.688732774
2016-01-01	4.415859108