Year	Ratio
1989-01-01	0.469619989395142
1990-01-01	0.440389990806580
1991-01-01	0.543399989604950
1992-01-01	0.596989989280701
1993-01-01	0.609899997711182
1994-01-01	0.674409985542297
1997-01-01	0.764110028743744
1999-01-01	0.639699995517731
2000-01-01	0.804130017757416
2001-01-01	0.621190011501312
2002-01-01	0.501659989356995
2003-01-01	0.517499983310699
2004-01-01	0.618929982185364
2005-01-01	0.672140002250671
2006-01-01	0.747950017452240
2007-01-01	0.848209977149963
2008-01-01	0.892709970474243
2009-01-01	0.915369987487793
2010-01-01	0.964559972286224
2011-01-01	0.990490019321442
2012-01-01	1.221210002899170
2013-01-01	1.251260042190550
2014-01-01	1.279700040817260
2015-01-01	1.302360057830810
2016-01-01	1.328179955482480