The Baltic Exchange’s dry bulk index, which tracks rates for vessels transporting dry commodities, soared about 7.3% to the highest since mid-December at 2,148 points on Friday. The capesize index, which typically transports 150,000-ton cargoes such as iron ore and coal, jumped 12% to 3,507 points; and the panamax index, which usually carries 60,000-70,000 tons …