Year	Ratio
1970-01-01	0.679740011692047
1971-01-01	0.716780006885529
1972-01-01	0.521839976310730
1973-01-01	0.522560000419617
1974-01-01	0.616259992122650
1975-01-01	0.603500008583069
1976-01-01	0.607969999313354
1979-01-01	0.679809987545013
1980-01-01	0.715810000896454
1981-01-01	0.741940021514893
1982-01-01	0.728359997272491
1983-01-01	0.744650006294250
1984-01-01	0.838180005550385
1985-01-01	0.880469977855682
1986-01-01	0.918160021305084
1987-01-01	0.939419984817505
1988-01-01	0.964519977569580
1989-01-01	1.016659975051880
1990-01-01	1.080240011215210
1991-01-01	1.120380043983460
1992-01-01	1.163609981536870
1993-01-01	1.185819983482360
1994-01-01	1.242179989814760
1995-01-01	1.253069996833800
1996-01-01	1.280050039291380
1997-01-01	1.353010058403020
1998-01-01	1.421910047531130
2009-01-01	1.447039961814880
2010-01-01	1.464599967002870
2011-01-01	1.453070044517520
2012-01-01	1.481109976768490
2013-01-01	1.483160018920900
2014-01-01	1.437980055809020
2015-01-01	1.409469962120060
2016-01-01	1.414270043373110