Table 8 Average Revenue Per Minute AT&T Communications Interstate Switched Service Year Average Revenue Per Minute 1984 32.3 ¢ 1985 30.8 1986 28.0 1987 24.5 1988 23.4 1989 21.8 1990 20.1 1991 19.7 1992 19.4 1993 18.9 1994 18.1