In what Election year was Adalberto Mosaner the Mayor with less than 16,170 Inhabitants?
CREATE TABLE "municipalities_in_trentino" (
  "municipality" text,
  "inhabitants" real,
  "mayor" text,
  "party" text,
  "election" real
);
SELECT SUM("election") FROM "municipalities_in_trentino" WHERE "mayor"='adalberto mosaner' AND "inhabitants"<'16,170';