A Treasury bond due in $1$ year has a yield of $4\%,$ while a Treasury bond due in $5$ years has a yield of $5\mathrm{.}5\%.$ A bond due in $5$ years issued by High Country Marketing Corp. has a yield of $12\%,$ while a bond due in $1$ year issued by High Country Marketing Corp. has a yield of $18\%.$ The default risk premium on the $5-$year bonds issued by High Country Marketing Corp. is $\_\_\_\_\_\_\_\_\_.$ Note: Express your answers in strictly numerical terms. For example, if the answer is $5\%,$ write $0\mathrm{.}05"$