This diagram shows which parties made it into Parliament and how many seats they held at elections from 1890 to 2017. The ‘U’ shape of the diagram is modelled on the seating in the parliamentary debating chamber, in which the governing party sits to the right of the speaker, who is seated at the open end of the ‘U’.
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Sources: Dieter Nohlen, Florian Grotz, and Christof Hartmann, Elections in Asia and the Pacific: a data handbook. Oxford: Oxford University Press, 2001, pp. 731–734; New Zealand Election Results