Year	Ratio
1981-01-01	0.975099980831146
1986-01-01	0.980369985103607
1989-01-01	0.963060021400452
1990-01-01	1.005259990692140
1991-01-01	1.034749984741210
1992-01-01	1.035199999809270
1999-01-01	1.028220057487490
2000-01-01	1.034790039062500
2001-01-01	1.006170034408570
2002-01-01	1.007580041885380
2003-01-01	1.011600017547610
2004-01-01	1.008820056915280
2005-01-01	1.003540039062500
2006-01-01	1.003090023994450
2007-01-01	1.001940011978150
2009-01-01	1.049559950828550
2010-01-01	0.996360003948212
2011-01-01	1.003970026969910
2012-01-01	0.999080002307892
2013-01-01	1.009189963340760
2014-01-01	1.008960008621220
2015-01-01	1.016020059585570
2016-01-01	1.000740051269530