Year	Ratio
1970-01-01	0.860310018062592
1972-01-01	0.939580023288727
1973-01-01	0.947880029678345
1974-01-01	0.977010011672974
1975-01-01	0.998310029506683
1976-01-01	1.027889966964720
1977-01-01	1.022609949111940
1978-01-01	1.044669985771180
1980-01-01	1.061890006065370
1981-01-01	1.063830018043520
1983-01-01	1.062700033187870
1984-01-01	1.027670025825500
1985-01-01	1.028830051422120
1986-01-01	1.028620004653930
1987-01-01	1.032940030097960
1991-01-01	0.965659976005554
1992-01-01	1.010079979896550
1998-01-01	1.071059942245480
1999-01-01	1.109439969062810
2000-01-01	1.092329978942870
2001-01-01	1.071949958801270
2002-01-01	1.079249978065490
2003-01-01	1.071640014648440
2004-01-01	1.066550016403200
2006-01-01	1.094910025596620
2007-01-01	1.113319993019100
2008-01-01	1.070170044898990
2009-01-01	1.094470024108890
2011-01-01	1.082139968872070
2012-01-01	1.108279943466190