1 in 3 Under the Pump !, page-213

Oh ... hang on..... now that I've read the link I see they do acknowledge the majority of tradies are in the $50k - $75 bracket.
I've got no hope of ever earning the national average income and usually dissuade people from doing a trade. It's a good stepping stone but most tradies I know earn pretty rubbish money.
My wife does admin with no formal skills and almost earns as much as me.