The UK The Department for Business, Innovation & Skills has published statistics on trade union membership in 2015. The proportion of the working population that were union members fell slightly from 25% to 24.7% – well down from 32.4% in 1995 when records began. In the private sector union membership also continued to fall from 14.2% to 13.9%. Membership now remains heavily concentrated amongst women, older workers, those in middle-income professional jobs, working for larger employers, in full-time and permanent positions and born in the UK. However, one of the lowest union densities is to be found in companies categorized as “professional, scientific or technical activities”.