How many schools left in 2002-03?
CREATE TABLE "former_members" (
  "institution" text,
  "location" text,
  "founded" real,
  "type" text,
  "enrollment" real,
  "joined" text,
  "left" text,
  "nickname" text,
  "primary_conference_when_joining_the_msfa" text,
  "current_primary_conference" text
);
SELECT COUNT("location") FROM "former_members" WHERE "left"='2002-03';