Year	Ratio
1970-01-01	1.042250037193300
1971-01-01	1.045420050621030
1972-01-01	1.047809958457950
1973-01-01	1.049350023269650
1974-01-01	1.054659962654110
1975-01-01	1.050469994544980
1976-01-01	1.046959996223450
1977-01-01	1.043439984321590
1978-01-01	1.043779969215390
1979-01-01	1.040529966354370
1980-01-01	1.031499981880190
1981-01-01	1.032529950141910
1982-01-01	1.025959968566890
1983-01-01	1.025419950485230
1984-01-01	1.015560030937190
1985-01-01	1.033200025558470
1986-01-01	1.033929944038390
1987-01-01	1.017179965972900
1988-01-01	1.017869949340820
1989-01-01	1.018360018730160
1990-01-01	1.149819970130920
1991-01-01	1.018919944763180
1992-01-01	1.055879950523380
1993-01-01	1.022259950637820
1994-01-01	0.993969976902008
1995-01-01	0.993030011653900
1996-01-01	0.996270000934601
1998-01-01	0.973309993743896
1999-01-01	1.000319957733150
2000-01-01	0.996659994125366
2001-01-01	0.990620017051697
2002-01-01	0.990840017795563
2004-01-01	0.987519979476929
2005-01-01	0.980350017547607
2006-01-01	0.985249996185303
2007-01-01	0.991659998893738
2008-01-01	0.994400024414063
2009-01-01	0.995720028877258
2010-01-01	0.981719970703125
2011-01-01	0.965300023555756
2012-01-01	0.966059982776642
2013-01-01	0.972809970378876
2014-01-01	0.966059982776642
2015-01-01	0.966769993305206
2016-01-01	0.970080018043518