Year	Months
2005-01-01	9.44961458225140
2006-01-01	10.88184180006810
2007-01-01	9.59316495936489
2008-01-01	12.85493442192780
2009-01-01	7.17812430436034
2010-01-01	4.27418988479239
2011-01-01	4.84418377073171
2012-01-01	6.86234350826604
2013-01-01	5.99629797790781
2014-01-01	5.61856883379718
2015-01-01	7.31067360391249
2016-01-01	6.50406839592382
2017-01-01	7.23674500048644
2018-01-01	7.99133187449947
2019-01-01	7.51224489180513