You are given the following information concerning three portfolios, the market portfolio, and the risk-free asset:

Portfolio	RP		P		P
X	11.0	%	33	%	1.45
Y	10.0		28		1.20
Z	8.1		18		0.75
Market	10.4		23		1.00
Risk-free	5.2		0		0

Assume that the correlation of returns on Portfolio Y to returns on the market is 0.66. What is the percentage of Portfolio Ys return that is driven by the market? (Round your answer to 4 decimal places.)