I cannot give you percentages but the amout of flap of the blade itself on a system that has a hinge to allow flapping is minimal to nil. The blade will only flap enough until it overcomes the friction of the flapping hinge. Take a helicopter on the ground for example (r22 in my view)
As you push up on the blade the blade will flex until you overcome the friction of the tettering bearing and which point the whole unit will move. Now pretend that the blades do not have any flex, almost as though they are spinning and centrifugal force is holding them solid. If you try and push up the opposing blade the resistance of the hinge is not enough to overcome the rigidity of the blade.
Are you perhaps confusing it with the blade absorbing the lead and lag forces?
My not so engineering background opinion