What is the total number of German submarines lost with more than 120958 sunk by mines?
CREATE TABLE "references" (
  "month_year" text,
  "sunk_by_u_boat" real,
  "sunk_by_aircraft" real,
  "sunk_by_warship_or_raider" real,
  "sunk_by_mines" real,
  "german_submarines_lost" real
);
SELECT COUNT("german_submarines_lost") FROM "references" WHERE "sunk_by_mines">120958;