Year	Months
2007-01-01	2.205156153
2008-01-01	3.378436424
2009-01-01	4.628589058
2010-01-01	4.124914261
2011-01-01	4.260414420
2012-01-01	5.439154060
2013-01-01	3.734793719
2014-01-01	6.165340651
2015-01-01	4.921954545
2016-01-01	4.860900777