The returns to a portfolio over the last $5$ years are:

Year

Portfolio Returns

$1$

$6\%$

$2$

$9\%$

$3$

$3\%$

$4$

$12\%$

$5$

$4\%$

The risk free rate is $4\mathrm{.}18\%$ per year. Calculate the Sharpe ratio. Enter your answer as a number rather than a percentage. That is$,$ if your answer is $0\mathrm{.}92,$ then enter $0\mathrm{.}92$ rather than $92\%.$