An electrostatic voltmeter consists of two attracted plates, one movable, and the other fixed. It is observed that the application of 10 kV between the plates results in a pull of 5 × 10^-3 N on the movable plate. The diameter of the movable plate is 100 mm. The change in capacitance (in pF) resulting from the change in position of the movable plate by 1 mm will be________. (up to 2 decimal)