What was the most recent year a height of 2770 m and a HC climb before 1992 was climbed?
CREATE TABLE "tour_de_france" (
  "height_m" text,
  "no_of_times_visited" real,
  "no_of_hc_climbs" real,
  "first_time_as_hc_climb" real,
  "most_recent" real
);
SELECT COUNT("most_recent") FROM "tour_de_france" WHERE "height_m"='2770' AND "first_time_as_hc_climb"<1992;