Department of Infrastructure, Transport, Regional Development and Communications
Financial year data.    Source: Telstra (2018), Telstra Annual Report 2018, p.9,   "expanding our 4GX coverage to reach 99.2 per cent of the Australian population."     https://www.telstra.com.au/content/dam/tcom/about-us/investors/pdf%20F/2018-Annual-Report.pdf  