Consider the following information concerning three portfolios, the market portfolio, and the risk-free asset: Portfolio RP P P X 13.0 % 39 % 1.75 Y 12.0 34 1.30 Z 7.2 24 .85 Market 11.0 29 1.00 Risk-free 5.6 0 0 Assume that the correlation of returns on Portfolio Y to returns on the market is .78. What is the percentage of Portfolio Ys return that is driven by the market? (Enter your answer as a percent rounded to 2 decimal places. Omit the "%" sign in your response.) Ys return explained by market %