Despite severe flooding in some parts of the UK last winter, the ABI said premiums had been driven down by competition.
Its figures show that for buildings insurance, premiums paid fell by 6% to an average £230 a year.
For contents insurance the average premium paid fell by 5% to £124 a year.
An ABI spokesman, Malcolm Tarling, stressed that as the figures were averages, some people would have paid much more, and others much less.
"Some people's premiums will have gone up, especially if they are in an area of flood risk," he said.
"But premiums will also vary from company to company depending on whether they have experienced more or fewer claims then they were expecting."
There was severe flooding in parts of Somerset and close to the River Thames west of London.
As a result the insurance industry expects that it will eventually have to pay out £451m in flood-related claims on its policies.