CREATE TABLE table_204_561 (id DECIMAL, "fence" DECIMAL, "name" TEXT, "jockey" TEXT, "age" DECIMAL, "handicap  ( st-lb ) " TEXT, "starting price" TEXT, "fate" TEXT)

how many non finishers fates were unseated riders ?
SELECT COUNT(*) FROM table_204_561 WHERE "fate" = 'unseated rider'
SELECT COUNT(*) FROM "table_204_561" WHERE "fate" = 'unseated rider'