Year	Ratio
1972-01-01	1.154250025749210
1973-01-01	1.169309973716740
1977-01-01	1.317819952964780
1981-01-01	1.262410044670100
1982-01-01	1.310050010681150
1983-01-01	1.253630042076110
1984-01-01	1.336140036582950
1985-01-01	1.639999985694890
1986-01-01	1.635159969329830
1987-01-01	1.595270037651060
1990-01-01	1.508450031280520
1991-01-01	1.442980051040650
1992-01-01	1.545210003852840
1993-01-01	1.671509981155400
1997-01-01	1.255349993705750
1999-01-01	1.261569976806640
2000-01-01	1.298079967498780
2001-01-01	1.256680011749270
2002-01-01	1.282369971275330
2003-01-01	1.226150035858150
2004-01-01	0.969449996948242
2005-01-01	1.175840020179750
2006-01-01	1.168419957160950
2007-01-01	1.111179947853090
2008-01-01	1.047129988670350
2009-01-01	1.032610058784480
2010-01-01	0.988319993019104
2011-01-01	0.972519993782043
2012-01-01	0.985599994659424
2013-01-01	0.999660015106201
2014-01-01	0.993849992752075
2015-01-01	0.990899980068207
2016-01-01	1.009279966354370