Year	Ratio
1970-01-01	0.94274
1971-01-01	0.94458
1972-01-01	0.94512
1973-01-01	0.95158
1974-01-01	0.96126
1975-01-01	0.95668
1976-01-01	0.95316
1977-01-01	0.96255
1978-01-01	0.97315
1979-01-01	0.98130
1980-01-01	0.98927
1981-01-01	1.00181
1982-01-01	1.01338
1983-01-01	1.03522
1984-01-01	1.04599
1985-01-01	1.04724
1986-01-01	1.05802
1987-01-01	1.05425
1988-01-01	1.05004
1989-01-01	1.04645
1990-01-01	1.04501
1991-01-01	1.03705
1992-01-01	1.04916
1993-01-01	1.05827
1994-01-01	1.06824
1995-01-01	1.09233
1996-01-01	1.09726
1997-01-01	1.10888
1998-01-01	1.13260
1999-01-01	1.14181
2000-01-01	1.15382
2001-01-01	1.17059
2002-01-01	1.19895
2003-01-01	1.19557
2004-01-01	1.21581
2005-01-01	1.22334
2006-01-01	1.22702
2007-01-01	1.22735
2008-01-01	1.23116
2009-01-01	1.22681
2010-01-01	1.21786
2011-01-01	1.20928
2012-01-01	1.18536
2013-01-01	1.17171
2014-01-01	1.15663
2015-01-01	1.15366
2016-01-01	1.14794