Here's why:
* Official language: English is the official language of Australia. This means almost everyone in Australia speaks it to some degree.
* Diverse population: Australia has a very diverse population with many people who speak English as a second language. It's difficult to track how many people speak English fluently versus those who speak it as a second language.
* No official census: While Australia conducts a census, it doesn't track the number of people who speak English fluently.
However, we can say with certainty that a vast majority of Australians speak English. The Australian Bureau of Statistics reports that in the 2021 census, 75.2% of Australians spoke English as their only language at home. This means a large majority of the population uses English in their daily lives.