Year	Ratio
2005-01-01	98.52
2006-01-01	90.60
2007-01-01	85.87
2008-01-01	121.24
2009-01-01	110.81
2010-01-01	93.97
2011-01-01	104.14
2012-01-01	92.87
2013-01-01	84.43
2014-01-01	81.15
2015-01-01	79.71
2016-01-01	80.43
2017-01-01	76.08