Year	Ratio
1970-01-01	0.915920019149780
1975-01-01	0.970960021018982
1980-01-01	0.993780016899109
1981-01-01	0.996720016002655
1982-01-01	0.994949996471405
1983-01-01	0.991439998149872
1984-01-01	0.995169997215271
1985-01-01	0.993799984455109
1987-01-01	0.991879999637604
1988-01-01	0.991450011730194
1989-01-01	0.991999983787537
1990-01-01	0.995029985904694
1991-01-01	0.996699988842011
1992-01-01	1.001219987869260
1993-01-01	1.002099990844730
1994-01-01	1.004909992218020
1995-01-01	1.001899957656860
1996-01-01	1.000329971313480
1998-01-01	0.994409978389740
1999-01-01	0.984399974346161
2000-01-01	1.000820040702820
2001-01-01	0.999729990959167
2002-01-01	0.999960005283356
2003-01-01	0.998709976673126
2004-01-01	0.999830007553101
2005-01-01	1.000339984893800
2006-01-01	1.002040028572080
2007-01-01	1.004850029945370
2008-01-01	1.006809949874880
2009-01-01	1.007599949836730
2010-01-01	1.008260011672970
2011-01-01	1.008559942245480
2012-01-01	1.006629943847660
2013-01-01	1.004359960556030
2014-01-01	1.001350045204160
2015-01-01	0.998269975185394
2016-01-01	1.006739974021910