Year	Ratio
1970-01-01	0.86559
1971-01-01	0.90123
1972-01-01	0.89234
1973-01-01	0.90031
1974-01-01	0.89989
1975-01-01	0.89791
1976-01-01	0.91639
1977-01-01	0.91454
1978-01-01	0.91848
1979-01-01	0.92757
1980-01-01	0.94613
1981-01-01	0.93895
1982-01-01	0.92873
1983-01-01	0.94540
1984-01-01	0.96233
1985-01-01	0.99093
1986-01-01	1.01296
1987-01-01	1.02114
1988-01-01	1.04308
1989-01-01	1.05890
1990-01-01	1.06043
1991-01-01	1.05839
1992-01-01	1.10293
1993-01-01	1.09157
1994-01-01	1.11775
1995-01-01	1.16211
1996-01-01	1.16520
1997-01-01	1.15202
1998-01-01	1.20549
1999-01-01	1.19889
2000-01-01	1.20718
2001-01-01	1.26412
2002-01-01	1.30817
2003-01-01	1.28058
2004-01-01	1.27612
2005-01-01	1.28058
2006-01-01	1.24426
2007-01-01	1.27757
2008-01-01	1.29285
2009-01-01	1.27754
2010-01-01	1.27284
2011-01-01	1.27224
2012-01-01	1.33111
2013-01-01	1.34783
2014-01-01	1.36671
2015-01-01	1.39971
2016-01-01	1.40349