Year	Months
2004-01-01	19.72939163455410
2005-01-01	22.47528910828010
2006-01-01	20.16090190488370
2007-01-01	20.92768980470780
2008-01-01	20.12610803711190
2009-01-01	15.88756930170350
2010-01-01	11.51097718620940
2011-01-01	10.85460375259530
2012-01-01	9.99706343718435
2013-01-01	10.63300173076190
2014-01-01	12.93122936190830
2015-01-01	13.58455941250360
2016-01-01	14.62730453155370
2017-01-01	12.91435116173440
2018-01-01	12.49072919282370
2019-01-01	11.75373129178680