The number of registered unions peaked at 499 in 1937, after the first Labour government made union membership compulsory. The number then dropped to around 200. After 1991, when membership became voluntary under the Employment Contracts Act, it fell even further, to the lowest total in more than a century. When a new Labour government repealed the act, the number of unions rebounded to around 180.
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Te Ara - The Encyclopedia of New Zealand
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Source: Department of Labour
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