What is the most current year with a previous conference of Mid-Indiana in Converse?
CREATE TABLE "former_members" (
  "school" text,
  "location" text,
  "mascot" text,
  "num_county" text,
  "year_joined" real,
  "previous_conference" text,
  "year_left" real,
  "new_conference" text
);
SELECT MAX("year_joined") FROM "former_members" WHERE "previous_conference"='mid-indiana' AND "location"='converse';