The National Provincial Championship, or NPC, was the major domestic rugby competition in New Zealand. The NPC saw many alterations to its format and brand. In 2006, it was replaced by two competitions, the Air New Zealand Cup (now known as the Bunnings NPC) and the Heartland Championship. The NPC was first contested in 1976, and although the basic format of Division One was much the same from then until the 2006 reorganisation, there were a number of changes to the lower divisions. Auckland were the most successful team in the NPC championship, having won 15 of the 30 series.