Here’s the survey in question.
Sydney - Survey 4, 1998
#1 2UE: 13.3
#2 2MMM: 11.8
#3 2Day: 11.3
=#4 2WS: 9.2
=#4 Mix 106.5: 9.2
#6 2CH: 7.6
#7 2BL: 6.3
#8 2JJJ: 5.9
#9 2KY: 4.1
#10 2GB: 3.9
#11 ABCFM: 2.7
=#12 2RN: 2.0
=#12 2SM: 2.0
#14 NewsRadio: 1.9
2SM was scoring a 2.0% share, back when it was a station playing mainly 60s & 70s music, and before Bill Caralis had bought the station.
EDIT: Post updated to include more stations.