Year	Ratio
1971-01-01	0.983020007610321
1972-01-01	0.987070024013519
1973-01-01	0.990769982337952
1974-01-01	0.995000004768372
1975-01-01	0.999870002269745
1976-01-01	1.006510019302370
1977-01-01	1.009850025177000
1978-01-01	1.011780023574830
1979-01-01	1.006170034408570
1980-01-01	1.001250028610230
1981-01-01	1.005210041999820
1982-01-01	1.002249956130980
1983-01-01	1.005380034446720
1984-01-01	1.005439996719360
1985-01-01	1.004510045051570
1986-01-01	1.004850029945370
1987-01-01	1.002750039100650
1988-01-01	1.003690004348750
1989-01-01	1.001449942588810
1990-01-01	0.996879994869232
1991-01-01	0.997659981250763
1992-01-01	1.002689957618710
1993-01-01	1.004089951515200
1994-01-01	1.002730011940000
1995-01-01	1.019369959831240
1996-01-01	1.004179954528810
1997-01-01	1.005489945411680
1998-01-01	1.003509998321530
1999-01-01	1.001680016517640
2000-01-01	0.999970018863678
2001-01-01	0.999130010604858
2002-01-01	0.990109980106354
2003-01-01	0.986299991607666
2004-01-01	0.976119995117188
2005-01-01	0.978810012340546
2006-01-01	0.978079974651337
2007-01-01	0.980289995670319
2010-01-01	0.981700003147125
2011-01-01	0.983460009098053
2012-01-01	0.982490003108978
2013-01-01	0.983489990234375
2014-01-01	0.988160014152527
2015-01-01	0.990800023078918