Rural West Auckland, we've gone from 4-10 a year (frequently long outages, sometimes well over 12 hours), to an average of about 1.5 in the last 2 years (including a full 12-18 month streak of no outages), and all fixed in a 0.5-6 hour timeframe.  A pretty much fully overhead network.

There is no doubt that this is due to the awesome effort that Vector have put in (where United Networks failed) getting property owners to cut back trees, for a period you couldn't go down the road without seeing a Vector ute with a Treescape truck nearby cutting back shelter-belts too close to wires (at the tree owners expense).  I also think they put a bit of work in providing redundancy of feeders.