Use the following data on bond yields:

$$This YearLast YearYield on top$-$rated corporate bonds$5\mathrm{.}6\%8\mathrm{.}6\%$Yield on intermediate$-$grade corporate bonds$7\mathrm{.}6\%10\mathrm{.}6\%$

Required:

Calculate the confidence index this year and last year.