Year	Ratio
1970-01-01	1.14349
1971-01-01	1.13997
1972-01-01	1.14339
1973-01-01	1.14433
1974-01-01	1.14935
1975-01-01	1.13876
1976-01-01	1.13394
1977-01-01	1.14057
1978-01-01	1.15538
1979-01-01	1.16267
1980-01-01	1.17634
1981-01-01	1.18520
1982-01-01	1.19086
1983-01-01	1.19968
1984-01-01	1.20825
1985-01-01	1.20617
1986-01-01	1.21427
1987-01-01	1.19711
1988-01-01	1.17795
1989-01-01	1.15634
1990-01-01	1.13170
1991-01-01	1.10572
1992-01-01	1.09951
1993-01-01	1.09981
1994-01-01	1.10140
1995-01-01	1.10702
1996-01-01	1.09309
1997-01-01	1.07678
1998-01-01	1.10394
1999-01-01	1.11691
2000-01-01	1.12859
2001-01-01	1.14727
2002-01-01	1.18471
2003-01-01	1.16945
2004-01-01	1.19779
2005-01-01	1.20536
2006-01-01	1.20580
2007-01-01	1.20418
2008-01-01	1.20895
2009-01-01	1.19950
2010-01-01	1.18286
2011-01-01	1.16662
2012-01-01	1.12441
2013-01-01	1.10588
2014-01-01	1.08304
2015-01-01	1.07694
2016-01-01	1.06579