property stock for perth metro

Here's a list of the Perth metrolpolitan local authorities (Councils) with the number of properties for sale in each. My understanding is that under "normal" market conditions Perth property stocks are around 12,000.

The stock on the market today represents almost a 60% increase on what's considered "normal".

WC8

Local Authority Number On Market
Armadale 631
Bassendean 102
Bayswater 528
Belmont 298
Cambridge 241
Canning 637
Claremont 129
Cockburn 998
Cottesloe 125
East Fremantle 76
Fremantle 328
Gosnells 861
Joondalup 1241
Kalamunda 512
Kwinana 368
Mandurah 1887
Melville 827
Mosman Park 119
Mundaring 407
Nedlands 227
Pep't Grove 19
Perth 497
Rockingham 1664
Serp-Jar'dale 248
South Perth 437
Stirling 1926
Subiaco 183
Swan 1179
Victoria Park 286
Vincent 286
Wanneroo 2018
Total 19285