Except for those who are exposed to chemical causes of skin cancer (tar, pitchblend, arsenic, radium) statistics linking occupation and incidence seem very hard to track down. What is easier to find though are studies which show that the main factors include excessive exposure causing sunburn. This is most hazardous to those below 25 and those who are not regularly exposed to the sun, and those with particular skin types and colouring (fair hair and eyes, fair skin).
In fact there are figures which indicate that occupations or lifestyles (those who spend their lives on the golf course etc.) which involve year round exposure to sun such that the parts of the body normally exposed develop a darker pigmentation from low levels of UV are in fact less likely to develop skin cancer than someone who does not get much exposure in their normal lifestyle and who then gets sunburnt.
Earlier this morning I heard something on the radio (Today probably) where two 'experts' were asked to advise listeners how to survive the predicted heatwave. One was an architect (advice included having turf roofs on houses to get the benefit of evaporative cooling) the other was an explorer (advice included lying under your camel to benefit from its shade). Where the BBC got these two clowns from I don't know, but the point was made that pretty soon London will have the climate of Marseilles and we'd better get used to it and learn from those living in such extreme climes how to survive.
Now I must admit that I've never been to Marseilles, swinging by on the E15 is the nearest I've come, so I can't be certain that it is not the hottest place on earth, but I understand that there are quite a few people living there and that they seem to survive the climate pretty well. I'm also fairly sure they don't all have living roofs or personal shade camels. I suspect they 'adapt' just as we did when we lived in Spain a few years ago, by being sensible. We soon realised that the locals and the tourists behaved in completely different ways. The locals always walked on the shady side of the street leaving the sunny side for the tourists, in fact the locals had a completely innate homing instinct for shade. It also helps if you have a siesta during the hottest part of the day and wear a hat if you have to be in the sun.
Of course, back in the mid seventies, sun blocks didn't exist. Well they did, but they were called 'clothes' and didn't come in a bottle. What did come in bottles were sun tan lotions. Piz Buin was the market leader then, with advertising designed to show how brown you would get not how white you would stay. Factor was a mathematical term, not an indicator of how little tan you would get from your sun lotion, which could also be used for frying if you ran out of olive oil.
I've just remembered there is a bottle of sun cream in the bottom of the show box put there by Mrs J in case we were in the show ring in the blazing sun. I don't think it's ever been used, not for years anyway, and I've no idea what 'factor' it is. I get by with a panama hat.