How many appointed archbishops were ordained as priests on December 20, 1959
CREATE TABLE "archbishops" (
  "archbishop" text,
  "born" text,
  "ordained_priest" text,
  "ordained_bishop" text,
  "appointed_archbishop" text,
  "vacated_throne" text,
  "died" text
);
SELECT COUNT("appointed_archbishop") FROM "archbishops" WHERE "ordained_priest"='December 20, 1959';