Opinion polling was commissioned throughout the duration of the 47th New Zealand Parliament and in the leadup to the 2005 election by various organisations.
Party vote and key events in the leadup to the 2005 election
Refusals are generally excluded from the party vote percentages, while question wording and the treatment of "don't know" responses and those not intending to vote may vary between survey firms.
References
Opinion polling for the New Zealand general election, 2005 Wikipedia(Text) CC BY-SA