Total accident numbers are less important than rates...
Number produced
Electra: 170 claimed in Wiki though many say not much more than 120 actually delivered
Iluyshin 18: 719
Viscount: 436
So by those figures
57/170 Electras .... 1 in 3 on large production figures.. 1 in 2 on smaller!
99/719 Iluyshins .... 1 in 7
144/436 Viscounts.... 1 in 3
Then again that makes no allowance for actual numbers of sectors operated, or hours... man statistics can be hard.