As this table shows, there have been a variety of formats for the NPC, but until 2011 it involved three competitions. At the top level – as in the Ranfurly Shield – Auckland and Canterbury have been the most successful teams. Since 2000 only Wellington, Waikato and Taranaki have challenged the two leading provinces.
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Te Ara - The Encyclopedia of New Zealand
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Source: Wikipedia - National Provincial Championship and ITM Cup
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