Low rates all seem to be high-education and well-paid: software, engineers, scientists, dentists. High rates are mostly low-paid, high-stress, and/or require travel: factory, nurses, drivers.
It's very interesting to see that Actuaries have the lowest divorce rates. Marriage seems to be based more on a good estimation of the partner than whims of liking.
My gut says that the occupations with the higher incidence of divorce are ones that have lower educational/qualification thresholds and in which people may be likely to marry when they are younger. It would be interesting to know if this is backed up by data.