Here are some statistics but they go back to 2014. I don't think there will be much greater change.
WEEKLY ATTENDANCES.
afl 32,163
nrl 15,940
rugby 19,629
soccer 12,347
GRAND FINAL ATTENDANCE
afl 100,007
nrl 81,491
rugby 25,800
soccer 42,102
TV VIEWING
afl 519,975
nrl 590,145
rugby 82,246
soccer 84,072
PARTICIPATION RATES
afl 222,600
nrl 95,200
rugby 95,600
soccer 368,600