Meanwhile, the rates of reporting assault, robbery, harassment and threatening behaviour had increased to 30 per cent, up from 25 per cent two years ago.
The total amount of crime being reported has remained the same at 25 per cent since the survey began in 2018.
Police today welcomed the rise in reporting assault crime, saying it showed a growth in public confidence.
"There's essentially more trust than ever that we will solve these incidents in a timely and effective manner," said Assistant Commissioner Bruce O'Brien.
However, with 75 per cent of crime going unreported, the situation could only be changed if people came forward.
"We can only solve crimes that we know about," said O'Brien.
"If it's not reported to us then our chances of being able to make a difference are significantly reduced."
As well as new reporting channels such as the 105 non-emergency line, the multi-agency work through Integrated Safety Response and Whāngaia Ngā Pā Harakeke programmes had enabled agencies to report family harm violence that would not be recorded by traditional reporting channels.