Although it's becoming less meaningful statistic due to a host of reasons the audience figures for free-to-air (FTA) TV have almost always had the ABC trailing the smallest commercial network. A 2009 graph[0] shows how it's historically been although digging into more recent numbers their position is slightly better with the new digital channels.[1] Although we are in the holiday season and the commercial channels seem to perform better in other portions of the year.

[0] https://www.screenaustralia.gov.au/research/statistics/archf...

[1] (~467k pdf) http://oztam.com.au//documents/2015/OzTAM-20151227-C1MetFTAS...