Consider the following information concerning three portfolios, the market portfolio, and the risk-free asset: Portfolio RP P P X 15.5 % 36 % 1.35 Y 14.5 31 1.15 Z 7.4 21 .60 Market 11.7 26 1.00 Risk-free 7.0 0 0 Assume that the correlation of returns on Portfolio Y to returns on the market is .87. 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 %