Year	Months
2004-01-01	2.521763261382010
2005-01-01	0.179786599202386
2006-01-01	5.450343286924550
2007-01-01	4.625973373884020
2008-01-01	4.669137443929570
2009-01-01	6.487169120539320
2010-01-01	5.194691617439630
2011-01-01	6.500528909789890
2012-01-01	5.569736785834160
2013-01-01	4.852643912989740
2014-01-01	3.791579917945140
2015-01-01	3.541944550008700
2016-01-01	4.074164043546530
2017-01-01	4.107370892462650
2018-01-01	3.932648487861530
2019-01-01	3.827109245455860