Year	Months
2004-01-01	2.70296188340230
2005-01-01	2.64095333699919
2006-01-01	2.87791309525877
2007-01-01	3.19561544530085
2008-01-01	3.05892629874532
2009-01-01	3.40954990784318
2010-01-01	2.92794739094940
2011-01-01	2.85008107406433
2012-01-01	3.72746942059711
2013-01-01	3.78513145780361
2014-01-01	5.41732065414696
2015-01-01	5.59994281182926
2016-01-01	4.74163273274245
2017-01-01	4.11334259134646
2018-01-01	4.36590331344398
2019-01-01	4.54308930623328