Year	Ratio
1979-01-01	0.978829979896545
1980-01-01	0.892799973487854
1982-01-01	0.979759991168976
1983-01-01	1.005720019340520
1985-01-01	1.034940004348750
1986-01-01	1.051200032234190
1987-01-01	1.065850019454960
1988-01-01	1.089349985122680
1989-01-01	1.156049966812130
1990-01-01	1.151489973068240
1991-01-01	1.177649974823000
1992-01-01	1.206799983978270
1993-01-01	1.228690028190610
1994-01-01	1.247120022773740
1995-01-01	1.261620044708250
1996-01-01	1.259719967842100
1997-01-01	1.271000027656560
1998-01-01	1.260470032691960
1999-01-01	1.250190019607540
2000-01-01	1.240470051765440
2001-01-01	1.236310005187990
2002-01-01	1.268919944763180
2003-01-01	1.279260039329530
2004-01-01	1.278730034828190
2005-01-01	1.287330031394960
2006-01-01	1.291409969329830
2007-01-01	1.291579961776730
2008-01-01	1.286910057067870
2009-01-01	1.287979960441590
2010-01-01	1.274180054664610
2011-01-01	1.268090009689330
2012-01-01	1.268470048904420
2013-01-01	1.254310011863710
2014-01-01	1.252840042114260
2015-01-01	1.252699971199040