Year	Months
2004-01-01	0.390419195660270
2005-01-01	0.684066553407569
2006-01-01	1.425455756590760
2007-01-01	0.446458699344024
2008-01-01	0.881298133070728
2009-01-01	2.245055563605610
2010-01-01	2.568640900665800
2011-01-01	2.560041058015380
2012-01-01	2.736789372052510
2013-01-01	3.219006509024130
2014-01-01	3.909138727295280
2015-01-01	4.299203069536620
2016-01-01	3.668191386234240
2017-01-01	3.657498424518510
2018-01-01	3.348630238905050
2019-01-01	3.289974146462350