ABS have published provisional arrival statistics into Australia for April 2020. No surprises that total arrivals of ~ 21,600 for the month (720/day) is down 98.7% on April 2019. About 70% of these were Australian citizens.
Overseas Travel Statistics, Provisional, June 2021
Provisional statistics on international travel based on initial border crossings, arriving in and departing from Australia, including tourism trips
www.abs.gov.au