Employed persons 2006-07 in Australia:

-Proffestionals 19.3%
-Intermediate clerical and service workers 16.5%
-Associated professionals 12.9%
-Tradespeople and related work 12.7%
-Elementary clerical and service workers 9.3%
-Labourers and related workers 8.6%
-Managers and Administrations 8.2%
-Advanced clerical and related workers 3.8%

(Source: Adapted from 'Employed Persons',ABS Website, 2009)

--->why would it be possible to have so few labourers,but so many professionals?

This is a service economy, not a manufacturing economy.