What was the host city in years where the host school was école de technologie supérieure?
CREATE TABLE "table1_2331549_1" (
  "year" real,
  "host_city" text,
  "host_school" text,
  "champion" text,
  "second_place" text,
  "third_place" text
);
SELECT "host_city" FROM "table1_2331549_1" WHERE "host_school"='École de technologie supérieure';