At first the number of telephones rose rapidly, virtually doubling every five years until 1915. Growth in numbers then slowed, particularly during the world wars, and in the 1930s depression, when numbers dropped slightly. After the Second World War growth sped up.
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Te Ara - The Encyclopedia of New Zealand
This item is licensed under a Creative Commons Attribution-NonCommercial 3.0 New Zealand Licence
Source: Statistics New Zealand
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