122 British firefighters have been killed since 1978. 82 of these were on operational duties, this provides a mean of 3.03.
It should be noted, however, that working conditions and equipment have improved dramatically since 1978.
Rather than try to give a very long and protracted answer to your question I have provided a link which will give you the answer that you require, I hope this helps
You will get rude answers to this one. There is some public scepticism about the nature of their working conditions.
In the 'course of duty' - not many.
at a guess id say 1-2% - i know its not very high
numbers or %.