The fall in the headline figure was driven by an 11.9 per cent dip in fuel prices for the month.Housing costs were the largest contributor to annual inflation, up 6.5 per cent.The trimmed mean is the RBA's preferred measure of inflation as it removes the biggest price swings and volatility.Responding to a reporter's question about the annual trimmed mean on Wednesday, Chalmers pointed the finger at the conflict in the Middle East Asked if headline inflation had come down "because of the fuel excise cut", the treasurer said the cut had partially contributed to the fall, but denied it was wholly responsible."The government's efforts to cut the fuel excise are part of the story but not the whole story, even when it comes to this very welcome moderation in fuel cost reflected in the inflation figures today," he said