Do Fortune Tellers stack the misfortune avoidance?

[Jarkko]

If I as Ulm:Black Forest recruit several Fortune Tellers (who according to the excel sheet I dl:ed cancel 5% of bad events), do their bad-events-avoiding stack? And if they do stack, is it a straight 5% deduction for each (so 20 Fortune Tellers would mean no bad events at all) or is it a .95 modifier (so having 20 Fortune Tellers would mean 0.95^20=35% chance of bad event actually happening)?

[Endoperez]

Each of them has its own chance of preventing the event, so latter.

[Yvelina]

The latter for sure. I have had two bad events in one turn, with a screenful of fortune tellers in my capital. By the way, doesn't it seem that the capital city gets more than its share of events?

[Graeme Dice]

Your capital is the standard target for spells like hurricane, blight, baleful star, black death, which make it seem like it gets more events.

[Etaoin Shrdlu]

And I imagine that that kind of bad event can't be averted by anything but domes if caused by another nation specifically throwing it at you...