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I live in Melbourne and use a figure of 12 degrees to the East. What I do to set my scope up is to face south, according to the compass. I point the polar axis of the tripod about 12 degrees to the left of this magnetic south. If you look at the map provided by Vermin, you can get an idea of your deviation.
My understanding is that the magnetic pole does not coincide with the axis of the earth's rotation. The deviation is related to this as well as some local affects, like underground mineral deposits etc., and of course if you are standing next to a big lump of metal. I also find if I move my compass too close to the tripod the compass will swing toward it, so be careful of that too.
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