How many Inhabitants were there after 2009 in the Municipality with a Party of union for trentino?
CREATE TABLE "municipalities_in_trentino" (
  "municipality" text,
  "inhabitants" real,
  "mayor" text,
  "party" text,
  "election" real
);
SELECT AVG("inhabitants") FROM "municipalities_in_trentino" WHERE "party"='union for trentino' AND "election">2009;