More and more workers are in part-time jobs. A disproportionate number of part-timers have contingent and other nonstandard work arrangements (posing an organizing challenge for unions), and an increasing number of them work part-time involuntarily because they can't find full-time jobs. About 6.9 percent of part-time workers are union members, compared with 15.3 percent of full-time workers. Although union coverage for full-time workers has declined from 23 percent in 1983 (the first year of data) to 15.3 percent today, it has remained almost constant for part-time workers. The number of part-time workers who are union members has remained at basically 1.5 million workers.