Year	Months
2007-01-01	4.411877821
2008-01-01	5.763993823
2009-01-01	6.873493213
2010-01-01	5.291255398
2011-01-01	4.741845560
2012-01-01	4.601436178
2013-01-01	4.463266377
2014-01-01	4.859906174
2015-01-01	4.091106842
2016-01-01	3.729198065