The Crime Survey for England and Wales reports that there has been a drop of around 25% in physical assaults at work over the last decade. Verbal threats have reduced even more, showing a 30% decline.
The occupational groups most at risk are those interfacing with the public. The police experience five times as many assaults as the average occupation, and there are also above-average rates for those in the healthcare and social service professions.
The findings, in an HSE report, can be seen online at http://www.hse.gov.uk/statistics/causinj/ violence/violence-at-work.pdf