It's a ridiculously high amount of attacks IMO. Either one or two sex fiends on the loose targeting the area.
it would be interesting to have some comparable data from similar areas over a similar period of time around that era. You'd have to think that Northbridge/Highgate would naturally be more likely to have these types of attacks and therefore higher numbers. I wonder what the numbers would be for similar types of areas like say Subiaco or perhaps Leederville.
I'd imagine that if the numbers are significantly less then it leads far more credence to it being two or perhaps even just the one person doing all of these?