The increase in the pressure required to decrease the volume \( (\Delta V) \) of water is \( 6.3 \times 10^7 \, \text{N}/\text{m}^2 \). The percentage decrease in the volume is ________. (Bulk modulus of water \( = 2.1 \times 10^9 \, \text{N}/\text{m}^2 \))
