Returns on stocks X and Y are listed below: Period 1 2 3 4 5 6 7 Stock X -5% 4% 3% 9% 1% -3% 4% Stock Y 12% 7% -3% -2% 4% 6% -1% What is the (population) covariance of returns on the two stocks? Please round your answer to six decimal places. Note that the correct answer will be evaluated based on the full-precision result you would obtain using Excel