Year	Ratio
1976-01-01	0.660589993000031
1977-01-01	0.798629999160767
1978-01-01	0.742299973964691
1993-01-01	1.138499975204470
1999-01-01	1.174070000648500
2000-01-01	1.213009953498840
2001-01-01	1.147410035133360
2002-01-01	1.118980050086980
2003-01-01	1.154399991035460
2004-01-01	1.186529994010930
2005-01-01	1.124340057373050
2006-01-01	1.062530040740970
2007-01-01	1.216199994087220
2008-01-01	1.188390016555790
2009-01-01	1.202299952507020
2010-01-01	1.277549982070920
2011-01-01	1.274289965629580
2012-01-01	1.316509962081910
2013-01-01	1.355419993400570
2014-01-01	1.351269960403440
2015-01-01	1.435520052909850