New Zealanders may have won more than $347.7 million in Instant Kiwi prizes over the past five years, but the popular scratchcards have played a key part in the "normalisation of the problem," the Gambling Foundation says.
Figures released under the Official Information Act reveal the amount won from Instant Kiwi tickets has risen from $59 million in 2007-08 to $90.7 million in 2011-12.
The number of winners has increased from 9.5 million (2007-08) to 11.7 million (2011-12), with the average winning ticket increasing from $6 to $8.
While the number of games had decreased over the same period from 51 to 37, there had been a move to more expensive tickets with the first $20 Instant Kiwi introduced in 2011-12.
Over those five years the value of unclaimed prizes or games withdrawn from sale was $22 million.