A portfolio is composed of two stocks, A and B. Stock A has a standard deviation of return of 17%, while stock B has a standard deviation of return of 37%. Stock A comprises 58% of the portfolio, and the rest of the portfolio is stock B. If the variance of return on the portfolio is 0.037, the correlation coefficient between the returns on A and B is ________. Write your answer in decimal format, and round your answer to 2 decimal places.