Average annual percent changes in unit labor costs, selected industries, 1987-97 Percent change Railroad transportation (1987-96) -3.0 Telephone communications -0.8 Electric utilities 0.6 Air transportation 0.9 Trucking, exc. local 1.8 Gas utilities 2.7 U.S. Postal Service 3.3 Radio and TV broadcasting 3.9 Cable and other pay TV 5.8