That was consistent with both weak retail spending and the low level of residential building, he said.
At the end of the year 60 per cent of mortgage debt was on floating rates, which averaged 5.74 per cent, Reserve Bank data show. Most of the rest was on fixed-rate loans maturing in less than two years.
A year earlier only 46 per cent was on floating rates, which averaged 6.26 per cent.
Meanwhile, farmers appear to have been funding expenditure out of cashflow. Farm debt, which had quadrupled over the 2000s, shrank 0.5 per cent last year.
But business borrowing picked up, rising 1.7 per cent, after contracting 2.5 per cent in 2010 and 8 per cent in 2009.
"Although this increase is encouraging ... both investment and borrowing have fallen sharply in recent years and remain at a very low level," Nolan said.