The number of trade unions in New Zealand has varied dramatically as labour laws have changed. From a tiny total in the 19th century, the number reached a peak of 500 in the late 1930s, when union membership became compulsory. After compulsory unionism was abolished in 1991 by the Employment Contracts Act, unions dropped to a 20th-century low of fewer than a hundred, then rose slightly again with the repeal of the Act.
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Source: Department of Labour