Year	Ratio
1981-01-01	0.895020008087158
1991-01-01	0.897480010986328
1995-01-01	1.306270003318790
1996-01-01	1.116729974746700
1997-01-01	1.040169954299930
1999-01-01	1.067770004272460
2000-01-01	0.958400011062622
2001-01-01	0.956700026988983
2002-01-01	0.999989986419678
2003-01-01	0.967069983482361
2004-01-01	1.044960021972660
2005-01-01	1.045390009880070
2006-01-01	1.137820005416870
2007-01-01	1.121170043945310
2008-01-01	1.218330025672910
2009-01-01	1.261279940605160
2010-01-01	1.276000022888180
2011-01-01	1.222550034523010
2012-01-01	1.297709941864010
2013-01-01	1.296309947967530
2014-01-01	1.258679986000060
2015-01-01	1.225080013275150
2016-01-01	1.154760003089900