Year	Months
2004-01-01	0.0433335208594727
2005-01-01	0.0486125497576776
2006-01-01	0.3580972975232590
2007-01-01	0.5120140875789690
2008-01-01	0.9423096903029760
2009-01-01	2.3501839431664400
2010-01-01	2.3447252125308800
2011-01-01	2.0890876606372400
2012-01-01	2.1610557683243900
2013-01-01	1.7234017080512000
2014-01-01	1.8835200586069200
2015-01-01	2.4167068206648400
2016-01-01	2.9513272875556000
2017-01-01	3.0952395542209500
2018-01-01	2.8449296148779300
2019-01-01	2.9634384235158300