CREATE TABLE "list_of_winners" (
  "year" real,
  "player" text,
  "nation_of_citizenship" text,
  "team_represented" text,
  "position_primarily_played" text
);

Question: What is the sum of all the years that Landon Donovan won the ESPY award?
SQL: SELECT COUNT("year") FROM "list_of_winners" WHERE "player"='landon donovan';