The index, which is not seasonally adjusted, rose by 9.9 per cent over the year to December.
Nationally, the average mortgage size of $488,875 was up from $475,083 from the prior year.
Offsetting this, investors have backed off from Western Australia and the Northern Territory.
Finally, the share of AFG's market relating to investors ticked back up to 34 per cent.
My analysis was featured in today's The Age (Melbourne), Sydney Morning Herald, Brisbane Times, Business Insider Australia, and International Business Times.