As Ollie has said, it's difficult to draw conclusions. For example, a 2% camber airfoil that is 18% thick might act more like a symmetrical airfoil than a 2% camber that is only 6% thick. If you look at symmetrical wings, lift is still created by pressure differential as the stagnation point moves when the angle of attack is increased. A volume of air being displaced by angle of attack alone maybe only contributes 1/3 of the lift of a symmetrical section. Again, that may vary with the thickness as well.