2008 - Present. Annual measures of union membership in Michigan. Dataset includes the total number of employed individuals in Michigan, the total number of individuals who hold union membership in Michigan, and the total number of individuals whose jobs are covered by a union or an employee association contract. Data provided by the Bureau of Labor Statistics in the US Department of Labor. To find more union membership data, visit https://www.bls.gov/webapps/legacy/cpslutab5.htm.