Average 150 including 20 to 30 nucs ( some doubles overwintering to replace losses)
loose around 10% on average per year... some simply do not make it through winter, badgers and wasps probably account for a few plus woodpeckers attacking some of the pollys.... and in many seasons but one mouse!
We have lost some to vandalism... and in that I include colonies destroyed under order of bee inspectorate due to EFB and AFB. The EFB spread by itinerant swarm collectors not having the nouse to isolate for a couple of brood cycles and get them checked by SBI before selling (£100 a pop including foul brood!) Never have found the source of the disease although it was suspected that a beekeeper brought it in from out of county in one year.
AFB almost certain from infected honey being brought in from Cataluna Spain to make up horse feed next to the infected apiary.... colonies and hives destroyed by fire under the supervision of our SBI... the case was investigated and now the people making up the horse feed have moved away....
But of course with notifyable diseases, you can point the finger of blame... but never prove it!!
Bet you wish you never asked!