We have listed a few grey literature sources in your field to get you started including websites, gateways and more generally, tips to searching Google and Google Scholar. However, there could be many more useful and high-quality resources available.
Australian Bureau of Statistics (ABS)
The most comprehensive source of Australian statistical information is published by the Australian Bureau of Statistics (ABS), Australia's official statistical organisation. Access to ABS publications including year books, time series data and tables, metadata, economic models, 1996 and 2001 Census Basic Community Profiles are provided online.
Health Status of Victorians
Includes information about the health and determinants of health of Victorians.
Australian Institute of Health and Welfare
Is the national agency for health and welfare statistics.
World Development Indicators Online
World Bank describes the data as: "WDI Online offers the World Bank's comprehensive database on development data, covering more than 600 indicators, 208 countries, and 18 regional and income groups. The development data includes social, economic, financial, natural resources, and environmental indicators for more than forty years (1960 to 2004, where data are available).