Year	Ratio
1971-01-01	0.500320017337799
1972-01-01	0.539820015430450
1973-01-01	0.539290010929108
1974-01-01	0.550080001354218
1975-01-01	0.575789988040924
1976-01-01	0.568859994411469
1977-01-01	0.604019999504089
1978-01-01	0.664210021495819
1979-01-01	0.780499994754791
1980-01-01	0.875400006771088
1981-01-01	0.986599981784821
1982-01-01	0.793250024318695
1983-01-01	0.853439986705780
1984-01-01	0.887570023536682
1985-01-01	0.951160013675690
1986-01-01	0.992760002613068
1987-01-01	1.123980045318600
1988-01-01	1.233809947967530
1989-01-01	1.190950036048890
1990-01-01	1.274070024490360
1991-01-01	1.114629983901980
1992-01-01	1.100589990615840
1993-01-01	1.111709952354430
1994-01-01	1.053779959678650
1996-01-01	0.950079977512360
1997-01-01	0.969730019569397
2000-01-01	1.145810008049010
2002-01-01	1.033939957618710
2003-01-01	1.124819993972780
2004-01-01	1.131450057029720
2005-01-01	1.086899995803830
2006-01-01	1.143210053443910
2007-01-01	1.121250033378600
2008-01-01	1.116580009460450
2009-01-01	1.107740044593810
2010-01-01	1.137050032615660
2011-01-01	1.158669948577880
2012-01-01	1.152770042419430
2015-01-01	1.088050007820130
2016-01-01	1.072239995002750