One of the best resources for statistics about Australia is the yearbooks published by the Australian Bureau of Statistics.
The 2006 yearbook is available on-line at the ABS website.
http://www.abs.gov.au/ (put 2006 yearbook into the Google GO box on the main page) or follow this direct link 1301.0 – Year Book Australia, 2006
The yearbook is full of data about poulation, workforce, health, crime, culture. Much of the data also involves comparisons over the years.
Louise, Youth Librarian, Manly Library