A crystal has monoclinic structure, with lattice parameters \( a = 5.14 \, \text{Å} \), \( b = 5.20 \, \text{Å} \), \( c = 5.30 \, \text{Å} \) and angle \( \beta = 99^\circ \). It undergoes a phase transition to tetragonal structure with lattice parameters, \( a = 5.09 \, \text{Å} \) and \( c = 5.27 \, \text{Å} \). The fractional change in the volume \( \frac{\Delta V}{V} \) of the crystal due to this transition is ............... (Round off to two decimal places).