Year	Months
2007-01-01	3.265655348
2008-01-01	5.777523342
2009-01-01	5.032471342
2010-01-01	3.674643645
2011-01-01	4.952139379
2012-01-01	4.608357764
2013-01-01	5.913658140
2014-01-01	6.736616598
2015-01-01	4.710737855
2016-01-01	4.514834843