Private/Catholic school's minimum enrollment is?
CREATE TABLE "member_teams" (
  "institution" text,
  "location" text,
  "founded" real,
  "affiliation" text,
  "enrollment" real,
  "team_nickname" text,
  "primary_conference" text,
  "home_rink" text
);
SELECT MIN("enrollment") FROM "member_teams" WHERE "affiliation"='Private/Catholic';