The growth in streaming video use plus the growing number of connected devices is said to be the reason.
Video streaming is now the biggest single component of data consumption, slightly ahead of web browsing.
Total data consumption exceeded 1.36 exabytes – 1.36 billion gigabytes – in June. That, according to NBN Co, is "the equivalent of watching the David Attenborough's Planet Earth – in high definition – over 30.6 million times."
National averages can hide significant variations.
Looking at the states, Queensland recorded the highest average of 274GB, and Tasmania the smallest at 231GB.
Queensland was home to the customer that got through the most data in June 2019: a whopping 26,807GB. It seems likely this was a business customer, as that's approximately equivalent to watching five Netflix 4K video streams simultaneously around the clock.
There's also a divide between customers in metro areas and the rest of Australia. The average metro customer consumed 270GB in June, while those in non-metro areas averaged 246GB.
"Whether it is at home or at work, Australian's are consuming more data than ever before, said NBN Co CTO Ray Owen.
"Access to fast broadband services is driving a change in the way we interact online, especially as connected devices, streaming services, and flexible working arrangements become the norm.
"We expect these numbers to continue to grow as more and more homes and business connect to the network."