Year	Months
2004-01-01	2.211691392270810
2005-01-01	0.930616757937249
2006-01-01	0.482342528132394
2007-01-01	3.653445968993270
2008-01-01	6.382474388273640
2009-01-01	4.393721004457410
2010-01-01	4.100591918572660
2011-01-01	3.259752939681440
2012-01-01	3.465936371224060
2013-01-01	3.528378050978900
2014-01-01	3.855845355050790
2015-01-01	2.094563222457640
2016-01-01	1.437205862942600
2017-01-01	1.445310943676640
2018-01-01	1.347180307127140
2019-01-01	1.313040048493060