Year	Ratio
1971-01-01	0.640359997749329
1972-01-01	0.650309979915619
1973-01-01	0.655099987983704
1974-01-01	0.730790019035339
1975-01-01	0.739950001239777
1976-01-01	0.736819982528687
1977-01-01	0.665499985218048
1978-01-01	0.665560007095337
1979-01-01	0.670000016689301
1980-01-01	0.670170009136200
1981-01-01	0.669210016727448
1982-01-01	0.666279971599579
1983-01-01	0.671620011329651
1984-01-01	0.675249993801117
1985-01-01	0.681909978389740
1986-01-01	0.685169994831085
1987-01-01	0.694490015506744
1988-01-01	0.703729987144470
1989-01-01	0.717339992523193
1990-01-01	0.728919982910156
1991-01-01	0.735390007495880
1992-01-01	0.747780025005341
1993-01-01	0.753250002861023
1994-01-01	0.754849970340729
1995-01-01	0.765299975872040
1996-01-01	0.796729981899261
1997-01-01	0.817900002002716
1998-01-01	0.838909983634949
1999-01-01	0.825699985027313
2000-01-01	0.867179989814758
2001-01-01	0.886309981346130
2002-01-01	0.903890013694763
2003-01-01	0.919610023498535
2004-01-01	0.947740018367767
2005-01-01	0.962329983711243
2006-01-01	0.984340012073517
2007-01-01	1.000800013542180
2008-01-01	1.023929953575130
2009-01-01	1.042490005493160
2010-01-01	1.056699991226200
2011-01-01	1.120869994163510
2012-01-01	1.113479971885680
2013-01-01	1.119400024414060
2014-01-01	1.120880007743840
2015-01-01	1.120239973068240
2016-01-01	1.121930003166200