Year	Ratio
1970-01-01	1.491940021514890
1972-01-01	1.490689992904660
1973-01-01	1.476830005645750
1974-01-01	1.476430058479310
1975-01-01	1.444429993629460
1976-01-01	1.435160040855410
1977-01-01	1.450549960136410
1978-01-01	1.464439988136290
1979-01-01	1.446449995040890
1980-01-01	1.419360041618350
1981-01-01	1.376109957695010
1982-01-01	1.328999996185300
1983-01-01	1.301030039787290
1984-01-01	1.271919965744020
1985-01-01	1.260840058326720
1986-01-01	1.258909940719600
1987-01-01	1.265789985656740
1988-01-01	1.261600017547610
1989-01-01	1.247939944267270
1990-01-01	1.235769987106320
1991-01-01	1.245499968528750
1992-01-01	1.218060016632080
1993-01-01	1.191630005836490
1994-01-01	1.162410020828250
1995-01-01	1.139750003814700
1996-01-01	1.129590034484860
1997-01-01	1.105890035629270
1998-01-01	1.096680045127870
1999-01-01	1.088909983634950
2000-01-01	1.044250011444090
2001-01-01	1.022519946098330
2002-01-01	1.015789985656740
2003-01-01	1.013800024986270
2004-01-01	1.001230001449580
2005-01-01	0.998350024223328
2006-01-01	0.997529983520508
2007-01-01	0.991069972515106
2008-01-01	0.989560008049011
2009-01-01	0.995549976825714
2010-01-01	0.974839985370636
2011-01-01	0.965780019760132
2012-01-01	0.969280004501343
2013-01-01	0.975030004978180
2014-01-01	0.971780002117157
2015-01-01	0.967710018157959
2016-01-01	0.966679990291595