Correct me if this is wrong, but I believe that figures showed that 62 out of 140-some first-generation Harriers delivered to the RAF were lost, and the Marines lost 42 of 110 AV-8As - and in the mid-80s, this was the experience. The AV-8B/GR5 was only just entering service.
Also:
The Pulitzer Prizes | Far From Battlefield, Marines Lose One-Third of Harrier Fleet