Year	Months
2004-01-01	1.09316012656668
2005-01-01	2.35512544359593
2006-01-01	3.73061847301056
2007-01-01	3.11588221172225
2008-01-01	5.02204259650853
2009-01-01	4.36327621331690
2010-01-01	5.04097464251349
2011-01-01	7.11150565832463
2012-01-01	7.84432931859368
2013-01-01	7.22012208883239
2014-01-01	8.76548682140826
2015-01-01	10.68701552494050
2016-01-01	10.34634699000400
2017-01-01	6.06090351371587
2018-01-01	4.93121705397082
2019-01-01	5.54922950906997