Some of that might be explained by very high petrol prices for a period last year and steady increases in tobacco tax will be hitting the budgets of those households disproportionately.
But the Salvation Army has sounded a timely warning about a drug appearing at all income levels. Methamphetamine is becoming "possibly a plague", Johnson says.
"We need to redouble our efforts to address both the people making and selling the stuff and the people growing addicted to it," he said. "It just seems to get worse year on year."
It will be interesting to see whether it gets better or worse after the Government's directive to police, announced in December, that they should not prosecute possession and use of any drugs as a rule, and concentrate on the dealers.
The difficulty for the police will be that it becomes harder to find the dealers if they cannot threaten prosecution of those found in possession. Methamphetamine accounted for 45 per cent of drug convictions in the past year, up from 18 per cent 10 years ago.
But some conviction rates are dropping. Youth crime has hit its lowest level in 25 years and there were 600 fewer people in prison. The teen pregnancy rate is half what it was just eight years ago.
But youth suicide rose again over the year with a noticeable increase among young women. No problem ought to have higher urgency for the Government than youth suicide. It received no answers from the inquiry last year into mental health and addiction.
The overall picture of New Zealand society offered by the report is of slow progress on most fronts with a few stark problems that need more focused attention from the Government. Youth suicide is one, methamphetamine is another. Solutions must be found.