Year	Ratio
2005-01-01	62.6046445570498
2006-01-01	62.7761108053942
2007-01-01	69.5222898705178
2008-01-01	86.4187461006393
2009-01-01	85.0213682916181
2010-01-01	130.0916902325410
2011-01-01	146.0994894173650
2012-01-01	138.9663247159920
2013-01-01	123.8528857243170
2014-01-01	127.7800119932750
2015-01-01	119.0081105513440
2016-01-01	115.6815779346590
2017-01-01	104.0879410159480