CREATE TABLE table_203_370 (id DECIMAL, "year" DECIMAL, "competition" TEXT, "venue" TEXT, "position" TEXT, "event" TEXT, "notes" TEXT)

in what year did the runner participate in the most marathons ?
SELECT "year" FROM table_203_370 GROUP BY "year" ORDER BY COUNT(*) DESC LIMIT 1
SELECT "year" FROM "table_203_370" GROUP BY "year" ORDER BY COUNT(*) DESC NULLS LAST LIMIT 1