Table:
text: Head of the River (Queensland)
Participating Schools
Winning Head of the River Championship Events
School Location_ Enrolment Founded Denomination Day_Boarding School_Colours Abbreviation In_competition_since
St Margaret`s Anglican Girls` School Ascot 900 1895 Anglican Day & Boarding Navy Blue, White & Brown STM 1990
St Peter`s Lutheran College Indooroopilly 2000 1945 Lutheran Day & Boarding Maroon & White SPLC 1990
Stuartholme School Toowong 700 1920 Catholic Day & Boarding Red, Gold & Blue STU 1991

text: Head of the River (Queensland)
Participating Schools
Winning Head of the River Championship Events
School Location_ Enrolment Founded Denomination Day_Boarding School_Colours Abbreviation In_competition_since
All Hallows` School Brisbane 1300 1861 Catholic Day Light Blue & White AHS 1990
Brisbane Girls` Grammar School Spring Hill 1150 1875 Non-Denominational Day Royal Blue BGGS 1991
Brisbane State High School South Brisbane 2200 1921 Non-Denominational Day Sangria & Navy Blue BSHS 1990
Lourdes Hill College Hawthorne 850 1916 Catholic Day & Boarding Silver, Purple & White LHC 2000
St Aidan`s Anglican Girls` School Corinda 800 1929 Anglican Day Navy Blue, White & Brown STA 1990
St Hilda`s School Southport 750 1912 Anglican Day & Boarding Red, Yellow & Blue STH 1990

Question: What is the enrollment of the stm competing to win the Head of the River (Queensland) River Championships at participating schools since 1990?