Year	Ratio
1979-01-01	0.611220002174377
2005-01-01	0.984899997711182
2007-01-01	0.978670001029968
2008-01-01	0.976000010967255
2009-01-01	0.974969983100891
2010-01-01	0.991599977016449
2011-01-01	0.994960010051727
2012-01-01	1.004500031471250
2013-01-01	0.974470019340515
2014-01-01	0.970309972763062
2015-01-01	1.007539987564090
2016-01-01	0.982339978218079