Year	Ratio
1998-01-01	1.23275005817413
1999-01-01	1.23433995246887
2000-01-01	1.22307002544403
2002-01-01	1.20675003528595
2004-01-01	1.17227005958557
2005-01-01	1.19561994075775
2007-01-01	1.20568001270294
2008-01-01	1.18889999389648
2009-01-01	1.13385999202728
2010-01-01	1.12776994705200
2011-01-01	1.13196003437042
2012-01-01	1.12116003036499
2013-01-01	1.11652004718781
2014-01-01	1.10695004463196
2015-01-01	1.10236001014709
2016-01-01	1.09521996974945