Year	Ratio
1971-01-01	0.905300021171570
1972-01-01	1.172399997711180
1973-01-01	1.576230049133300
1974-01-01	1.363649964332580
1990-01-01	1.061210036277770
1992-01-01	1.060230016708370
1993-01-01	1.070979952812190
1999-01-01	1.075909972190860
2000-01-01	1.055619955062870
2001-01-01	1.052549958229060
2002-01-01	1.015380024909970
2003-01-01	0.989520013332367
2004-01-01	0.947279989719391
2005-01-01	0.932169973850250
2006-01-01	0.932690024375916
2007-01-01	0.947830021381378
2008-01-01	0.965290009975433
2009-01-01	0.982110023498535
2010-01-01	0.968729972839355
2011-01-01	0.961189985275269
2012-01-01	0.974860012531281
2013-01-01	0.975759983062744
2014-01-01	0.974240005016327
2015-01-01	0.985149979591370
2016-01-01	0.995809972286224