CREATE TABLE table_203_452 (id DECIMAL, "pos" DECIMAL, "no" DECIMAL, "driver" TEXT, "team" TEXT, "laps" DECIMAL, "time/retired" TEXT, "grid" DECIMAL, "points" DECIMAL)

what was the number of drivers that did not finish the race ?
SELECT COUNT("driver") FROM table_203_452 WHERE "time/retired" IS NULL
SELECT COUNT("driver") FROM "table_203_452" WHERE "time/retired" IS NULL