This is now the most number of sixes hit by any side against Australia in a Test series. The previous record was of 23 sixes hit by South Africa in four match series in 1966-67.
The following table lists the most sixes hit against Australia in a Test series:
6s For Season Venue Tests
26 England 2005 England 3#
23 South Africa 1966-67 South Africa 5
22 South Africa 1969-70 South Africa 4
22 India 1997-98 India 3
22 West Indies 2002-03 West Indies 4
21 New Zealand 1999-00 New Zealand 3
# still continuing