A company has improved its production process. Under the old process, 17 workers could produce 4,183 units per hours and the materials cost $58 per unit of output. Workers are paid $16 per hour and the finished product is sold for $128 per unit. After the improvement, materials costs have been reduced by $14 per unit of output and it now takes 4 fewer workers to make the same amount of output. What is the percentage change in multifactor productivity? (do not use a % sign, e.g. enter 50% as .5)