It accounts for a variety of fish products from the sea; some fish ponds are now being developed; ranked second to none in the manufacture of wooden shoes, a distributing center of retail and wholesale trade for Sibale and Bongabon, it has a busy market in the poblacion and a barrio market at Nabuslot. It is not only a coconut region, but it is also a retail and wholesale trade center. It stands with 5 drug stores, 74 dry goods stores, 2 jewelry and repair shops, 4 bars, and refreshment parlors, 4 barber shops, 3 furniture houses, 5 restaurants, 2 gasoline stations, 4 tailor shops, 4 bakeries, 4 photographers, 20 Chinese stores, 5 lumber and hardware dealers, 5 cockpits, 2 contractors, a PRISCO store, 16 copra dealers, 3 wooden shoe factories, 1 theatre, 36 public market stall holders, 17 fishermen, and 46 tuba dealers.
Question: How many more public market stall holders than copra dealers?
Answer: 20