Which Year is the lowest one that has an Athlete of markus thalmann, and a Time of 23:28:24?
CREATE TABLE "all_time_top_50_performances" (
  "athlete" text,
  "time" text,
  "country" text,
  "year" real,
  "place" real
);
SELECT MIN("year") FROM "all_time_top_50_performances" WHERE "athlete"='markus thalmann' AND "time"='23:28:24';