Year	Ratio
1985-01-01	0.351729989051819
1986-01-01	0.365779995918274
1987-01-01	0.398739993572235
1988-01-01	0.340050011873245
1989-01-01	0.324160009622574
1999-01-01	0.781610012054443
2003-01-01	0.686730027198792
2004-01-01	0.707409977912903
2005-01-01	0.707319974899292
2010-01-01	0.740000009536743
2011-01-01	0.691940009593964