Year	Ratio
1971-01-01	1.007449984550480
1972-01-01	1.006350040435790
1973-01-01	1.010100007057190
1983-01-01	1.090989947319030
1985-01-01	1.027850031852720
1986-01-01	1.035120010375980
1998-01-01	0.971599996089935
1999-01-01	0.975849986076355
2000-01-01	0.967339992523193
2002-01-01	1.008190035820010
2003-01-01	1.008880019187930
2004-01-01	0.949729979038239
2005-01-01	0.950860023498535
2006-01-01	0.950420022010803
2007-01-01	0.936429977416992
2008-01-01	0.932839989662170
2009-01-01	0.863409996032715
2010-01-01	0.880789995193481
2011-01-01	0.904380023479462
2012-01-01	0.904579997062683
2013-01-01	0.909020006656647
2014-01-01	0.908119976520538
2015-01-01	0.913110017776489
2016-01-01	0.924310028553009