Year	Ratio
1970-01-01	1.07195
1971-01-01	1.07475
1972-01-01	1.07761
1973-01-01	1.09286
1974-01-01	1.09364
1975-01-01	1.13431
1976-01-01	1.13237
1977-01-01	1.09753
1978-01-01	1.09110
1979-01-01	1.09127
1980-01-01	1.10640
1981-01-01	1.10473
1982-01-01	1.10098
1983-01-01	1.08945
1984-01-01	1.08263
1985-01-01	1.08396
1986-01-01	1.10813
1987-01-01	1.07984
1988-01-01	1.08084
1989-01-01	1.09469
1990-01-01	1.07733
1991-01-01	1.06539
1992-01-01	1.06200
1993-01-01	1.06198
1994-01-01	1.05934
1995-01-01	1.05812
1996-01-01	1.06277
1997-01-01	1.06328
1998-01-01	1.05710
1999-01-01	1.04904
2000-01-01	1.05297
2001-01-01	1.04945
2002-01-01	1.06975
2003-01-01	1.06501
2004-01-01	1.06174
2005-01-01	1.07339
2006-01-01	1.07641
2007-01-01	1.07140
2008-01-01	1.07086
2009-01-01	1.05063
2010-01-01	1.08310
2011-01-01	1.08380
2012-01-01	1.08216
2013-01-01	1.08163
2014-01-01	1.08533
2015-01-01	1.07969
2016-01-01	1.07286