The small foldout was for small country schools, with populations below 150 students.
Yet, by 1980, Mackenzie High School's enrollment had fallen below 2600 students, about half the figure reported for 1952.
The planning on the subdivision project began in 1995, when land prices sharply escalated and the island's school enrollment dropped below 100 students as young families departed.
However, after that, Ai Tong suffered the same problem and its enrollment soon fell below 800 students.
Classes are usually kept below 30 students.
Note: all schools between grades 9-12 are below 216 students.
The student body is relatively small compared to other liberal arts colleges, with a population historically below 500 students on each campus during a year.
The school hired more teachers to keep the numbers of students in each classroom below 30 students.
Less than 95 of Pennsylvania's 501 school districts have enrollment below 1250 students, in 2007.
Once enrollment went down below 2600 students, some extra classrooms were added in pods or trailers, during the summer of 1977, and the school was again full-time.