CREATE TABLE table_203_13 (id DECIMAL, "year" DECIMAL, "champion" TEXT, "score" TEXT, "runner-up" TEXT, "coach" TEXT)

in what year was their largest margin of victory ?
SELECT "year" FROM table_203_13 ORDER BY "score" - "score" DESC LIMIT 1
SELECT "year" FROM "table_203_13" ORDER BY "score" - "score" DESC NULLS LAST LIMIT 1