CREATE TABLE table_204_914 (id DECIMAL, "year" DECIMAL, "team" TEXT, "games" DECIMAL, "attempts" DECIMAL, "yards" DECIMAL, "ypc" DECIMAL, "long" DECIMAL, "tds" DECIMAL)

which year did dickerson earn the most rushing yards ?
SELECT "year" FROM table_204_914 ORDER BY "yards" DESC LIMIT 1
SELECT "year" FROM "table_204_914" ORDER BY "yards" DESC NULLS LAST LIMIT 1