An actuary determines that the annual numbers of tornadoes in counties P and Q are jointly distributed as follows: X\Y 0 1 2 PX(x) 0 0.12 0.13 0.05 0.30 1 0.06 0.15 0.15 0.36 2 0.05 0.12 0.10 0.27 3 0.02 0.03 0.02 0.07 pY (y) 0.25 0.43 0.32 1 where X is the number of tornadoes in county Q and Y that of county P. Calculate the conditional variance of the annual number of tornadoes in county Q, given that there are no tornadoes in county P.