Year	Months
2007-01-01	3.144454423
2008-01-01	4.140225231
2009-01-01	4.618377495
2010-01-01	3.444130402
2011-01-01	4.405452100
2012-01-01	1.800360796
2013-01-01	1.975110059
2014-01-01	2.541468222
2015-01-01	2.159160658
2016-01-01	2.194887648