What amount of times is the name, Bok De Korver listed?
CREATE TABLE "1905_1909" (
  "number" real,
  "date_of_debut" text,
  "name" text,
  "date_of_birth" text,
  "number_of_caps" real,
  "number_of_goals" real,
  "date_of_death" text
);
SELECT MAX("number") FROM "1905_1909" WHERE "name"='Bok de Korver';