The rise in hospitalisations can largely be attributed to the easing of restrictions, Australian Institute of Health and Welfare spokesman Adrian Webster says.

Almost 36,000 new cases of the virus and 37 deaths were recorded across Australia in the latest 24-hour reporting period, but the admissions climb is not solely due to more people catching COVID-19 thanks to eased restrictions.

"The increase also reflects efforts to clear the backlog of surgeries that had been created the previous year," Dr Webster said.

Elective surgery was suspended during the pandemic to avoid overloading hospital systems.

Data from the AIHW covers the year up to June 30, 2021, which does not include the outbreak of the more transmissible - but less severe - Omicron variant.

States continue to record thousands of new cases daily but many restrictions have been abandoned.

Australia has become one of the global leaders in infection rates, and the number of people who have died from the virus so far this year is more than double the previous two years combined.

The 2020-21 AIHW data shows more than 10 per cent of people who wound up in hospital with the virus never left, with 487 people dying from more than 4700 hospitalised.

More than 40 per cent of those in hospital also had one or more comorbidities such as diabetes or heart disease.

Some 329 people spent time in intensive care and 180 required ventilation.

People over 45 made up two-thirds of COVID-19 admissions, with children comprising about 4.4 per cent.

Hospital admissions increased by about 700,000, rising from 11.1 million in 2019-20 (including the first six months of the pandemic), to 11.8 million in 2020-21.

Admissions dropped 2.8 per cent in 2019-20 following annual growth of 3.3 per cent since 2014-15.

The 6.3 per cent increase in 2020-21 represented a return to the pre-pandemic trend in most jurisdictions.

Some 7.4 million of the 11.8 million people admitted to hospital left on the same day, which the AIHW said indicated less intensive surgeries.

It aligned with efforts to catch up on procedures delayed by the suspension of elective surgery.

Private hospitals were tasked with picking up the slack, with many public patients being treated privately.

"Private hospitals had a significant increase in admissions compared to public hospitals," Dr Webster said.

Catch-up cataract surgery was likely behind the largest increase in hospitalisations, with diagnoses relating to the eyes and surrounding tissue registering a 19 per cent surge, Dr Webster said.

Hospital admissions did not increase at the same rate in all states.

Victoria faced ongoing outbreaks and restrictions for much of the reporting period, with admissions in the state only rising 1.3 per cent compared to 2019-20.

LATEST 24-HOUR COVID-19 DATA:

NSW: 8383 cases, nine deaths, 1143 in hospital with 31 in ICU

Victoria: 9934 cases, 17 deaths, 528 in hospital with 30 in ICU

Queensland: 4455 cases, six deaths, 326 in hospital with five in ICU

Tasmania: 793 cases, two deaths, 48 in hospital with one in ICU

NT: 232 cases, no deaths, 15 in hospital with one in ICU

WA: 8452 cases, one death, 298 in hospital with eight in ICU

SA: 2901 cases, one death, 244 in hospital with six in ICU

ACT: 832 cases, one death, 84 in hospital with five in ICU.

Australian Associated Press