Year	Ratio
1970-01-01	0.91347
1971-01-01	0.91482
1972-01-01	0.92784
1973-01-01	0.96527
1974-01-01	1.02514
1975-01-01	1.06157
1976-01-01	1.09405
1977-01-01	1.12137
1978-01-01	1.14050
1979-01-01	1.11045
1980-01-01	1.10744
1981-01-01	1.10287
1982-01-01	1.10143
1983-01-01	1.09190
1984-01-01	1.11297
1985-01-01	1.12884
1986-01-01	1.16398
1987-01-01	1.16229
1988-01-01	1.14711
1989-01-01	1.12990
1990-01-01	1.14063
1991-01-01	1.11008
1992-01-01	1.13653
1993-01-01	1.15723
1994-01-01	1.20713
1995-01-01	1.25020
1996-01-01	1.29827
1997-01-01	1.31345
1998-01-01	1.28010
1999-01-01	1.30350
2000-01-01	1.31098
2001-01-01	1.33996
2002-01-01	1.34776
2003-01-01	1.34804
2004-01-01	1.35381
2005-01-01	1.36666
2006-01-01	1.38520
2007-01-01	1.39724
2008-01-01	1.41621
2009-01-01	1.42312
2010-01-01	1.45751
2011-01-01	1.47219
2012-01-01	1.44707
2013-01-01	1.44025
2014-01-01	1.42251
2015-01-01	1.41316
2016-01-01	1.41072