what was the primary conference when joining the csfl for the institution that joined in 2004-05? 
CREATE TABLE "current_members" (
  "institution" text,
  "location" text,
  "founded" real,
  "type" text,
  "enrollment" real,
  "joined" text,
  "nickname" text,
  "primary_conference_when_joining_the_csfl" text
);
SELECT "primary_conference_when_joining_the_csfl" FROM "current_members" WHERE "joined"='2004-05';