Assume oil with a viscosity of 250 cP is produced from a fracture. The lateral dimension, W, of the fracture is 100 cm and aperture is 10 mm. The initial formation pressure is 5200 psi @ 500 ft away from the wellbore and the wellbore pressures are 4800 psi. After a year of production, the pressure at 500 feet decreases to 5000 psi and the fracture aperture decreased to 1 mm due to the effective pressure increase. Calculate the change in flow caused by the pressure decline.