Table:
text: Illinois Intercollegiate Athletic Conference
Membership
Membership
Institution Location_ Founded Years_in_IIAC_approx_ Team_Nickname
Illinois State University Normal, Illinois 1857 1910–1970 Redbirds
Bradley University Peoria, Illinois 1897 1910–1937 Braves
Eureka College Eureka, Illinois 1855 1910–1942 Red Devils
Hedding College (defunct) Abingdon, Illinois 1855 1910–1926 Orangemen
Illinois College Jacksonville, Illinois 1829 1910–1937 Blueboys
Illinois Wesleyan University Bloomington, Illinois 1850 1910–1937 Titans
Lincoln College, Illinois Lincoln, Illinois 1865 1910–1928 Lynx
Lombard College (defunct) Galesburg, Illinois 1853 1910–1929 Golden Tornado/Olive
Millikin University Decatur, Illinois 1901 1910–1937 Big Blue
Shurtleff College (defunct) Alton, Illinois 1827 1910–1937 Pioneers/Bison
William & Vashti College (defunct) Aledo, Illinois 1908 1910–1917 unknown
Augustana College Rock Island, Illinois 1860 1912–1937 Vikings

Question: List the total number of institutions chartered in Rock Island, Illinois under the Illinois Intercollegiate Athletic Conference. ?