According to
Accident Database: By Manufacturer/Type > TU-154
There was only
11 air disasters with fatalities between years 1973 -1991. It may be not complete list.
First Prague disaster - not determined the cause, second Beirut - not determined too, it is still mysterious, maybe it was shot down. Nacias Nguema - not determined, Al Bayda - lack of fuel after divert....
According to
? russianplanes.net ? ???? ???????
there was
759 Tu-154 flying in 1991