The pattern of professors has changed a lot over the last 20 yrs. Back in the 80's most classes were taught be full time professors, not so anymore. My school was around 80% of classes taught by full time faculty in the late 80's. Now 25% of classes are taught by full time faculty (double the number of students and half the number of full time faculty compared to the late 80's) and 75% taught by adjuncts.
PBS did a documentary on this last year. One of the adjuncts in my department was featured. Up until this year we had 1 full time and 14-15 part time instructors. Now we have 2 full time.

__________________
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13