What is the earliest year a Chairman who took office after 2011 is up for reelection?
CREATE TABLE "current_members" (
  "name" text,
  "position" text,
  "party" text,
  "took_office" real,
  "up_for_reelection" real
);
SELECT MIN("up_for_reelection") FROM "current_members" WHERE "took_office">2011 AND "position"='chairman';