Year	Ratio
1991-01-01	1.038869976997380
1992-01-01	1.020169973373410
1993-01-01	1.019050002098080
1994-01-01	1.028769969940190
1995-01-01	1.023270010948180
1996-01-01	1.033980011940000
1997-01-01	1.072929978370670
1999-01-01	1.115159988403320
2000-01-01	1.013290047645570
2001-01-01	1.021980047225950
2002-01-01	1.003059983253480
2003-01-01	0.998969972133636
2004-01-01	1.005650043487550
2005-01-01	1.018280029296880
2006-01-01	1.024889945983890
2007-01-01	1.022060036659240
2008-01-01	1.021029949188230
2009-01-01	1.032920002937320
2015-01-01	1.015059947967530
2016-01-01	1.008859992027280