Year	Ratio
1970-01-01	0.641240000724792
1971-01-01	0.621890008449554
1972-01-01	0.613070011138916
1973-01-01	0.638790011405945
1974-01-01	0.701059997081757
1975-01-01	0.602439999580383
1977-01-01	0.689610004425049
1978-01-01	0.848720014095306
1979-01-01	0.895829975605011
1980-01-01	0.840399980545044
1981-01-01	0.939999997615814
1982-01-01	0.972800016403198
1983-01-01	0.972699999809265
1984-01-01	0.916499972343445
1985-01-01	1.013170003890990
1986-01-01	0.993359982967377
1987-01-01	0.986320018768311
1988-01-01	1.001240015029910
1989-01-01	0.866429984569550
1990-01-01	0.997969985008240
1991-01-01	1.123039960861210
1992-01-01	1.114979982376100
1995-01-01	1.236590027809140
1996-01-01	1.196009993553160
1998-01-01	1.074929952621460
1999-01-01	1.209139943122860
2000-01-01	1.252099990844730
2001-01-01	1.178449988365170
2002-01-01	1.159360051155090
2003-01-01	1.185930013656620
2004-01-01	1.188750028610230
2005-01-01	1.146770000457760
2006-01-01	1.191390037536620
2007-01-01	1.177670001983640
2008-01-01	1.103620052337650