1.2 mL of acetic acid is dissolved in water to make 2.0 L of solution. The depression in freezing point observed for this strength of acid is 0.0198$^\circ$C. The percentage of dissociation of the acid is ___________. (Nearest integer)

[Given : Density of acetic acid is 1.02 g mL^$-$1, Molar mass of acetic acid is 60 g mol^$-$1, K_f(H₂O) = 1.85 K kg mol^$-$1]