Bjarney,
According to the LineCAD software in my Faults truck, as of the last update, there were 327 50kVA transformers in use within our PoCo district. [Linked Image]
There is also a total of 1554 transformers of one sort or another in this area.
One thing you have to remember about this area, it's mainly Rural and with the advent of huge dairy farms, lifestyle blocks and the like, our Network here has had to be seriously upgraded here over the last couple of years.
11kV is on the way out over here, at least in this part of the country, with 22kV upgrades happening as a matter of course.
It wasn't that long ago when 33kV was our highest Network voltage here, now it's 66kV.