What year is the date when the boiler type is forward topfeed, the built at is Crewe, and lot number is less than 187?
CREATE TABLE "construction_details" (
  "br_no" text,
  "lot_no" real,
  "date" real,
  "built_at" text,
  "boiler_type" text
);
SELECT COUNT("date") FROM "construction_details" WHERE "boiler_type"='forward topfeed' AND "built_at"='crewe' AND "lot_no"<187;