November 27, 2016 4:00pm by David Farrar Union membership The data above is from the Registrar of Unions. While the big fall off in union membership was in the 1990s, it has continued. The percentage of the labour force in a union has gone from 18.5% to just over 15%. Share this:FacebookTwitterLinkedInRedditWhatsAppMorePinterestPrintTumblrLike this:Like Loading...