No, I'm pretty sure that it can't,
and, in fact, I doubt that you can find that information, anywhere!
That is not Public information, not recorded, and not published.
I would suggest that you go to one of those ubiquitous newspaper vending machines that have the RENTAL ads in them, and peruse through the ads for Mission Viejo and work up your own list and average.
A Realtor may handle one, two, or a couple rentals, but not enough to establish a significant average.
Good luck and may God bless... more