Year	Ratio
1993-01-01	1.045349955558780
1997-01-01	1.133890032768250
1998-01-01	1.066759943962100
1999-01-01	1.012320041656490
2000-01-01	1.054119944572450
2006-01-01	0.995880007743835
2010-01-01	1.005570054054260
2011-01-01	1.007099986076350
2012-01-01	1.009899973869320
2013-01-01	1.019770026206970
2014-01-01	1.025750041008000
2015-01-01	1.035199999809270
2016-01-01	1.026510000228880
2017-01-01	1.008939981460570