A trucking firm handles four commodities for a particular distributor. Total shipments for the commodities in the years 2000 and 2015, as well as the prices in the year 2000, are reported in the following table. Shipments Price/Shipment Commodity 2000 2015 2000 A 115 95 $1,200 P 88 75 $1,800 C 40 55 $2,000 D 60 70 $1,500 Develop a weighted aggregate quantity index with a 2000 base. (Round your answer to the nearest integer.) 2015 = Comment on the growth or decline in quantities over the 2000-2015 period. O Quantities are down substantially, by more than 5%. O Quantities are up substantially, by more than 5%. O Quantities are up slightly, by less than 5%. O Quantities are down slightly, by less than 5%