Chart Detail

Updated August 27, 2014

Documentation and methodology

Data are from Hirsch and Macpherson (2003), http://unionstats.gsu.edu/Hirsch-Macpherson_ILRR_CPS-Union-
Database.pdf; updated at unionstats.com. The data on union coverage begin in 1977 and are extended back to 1973, based on percentage-point changes in union membership shares in Hirsh and Macpherson (2003).

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