Answer is: increase.
Balanced chemical reaction of dissociation of perchloric acid in water:
HClO₄(aq) → H⁺(aq) + ClO₄⁻(aq).
Ionic compounds (in this example perchloric acid) conduct electricity, because it dissociate in ions and ions conduct electicity.
Ionic substances dissociate in water on cations and anions.
Perchloric acid (HCO₄) is one of strongest inorganic acids.