Name the total number of domestic mail for 7853 for total frieght and mail
CREATE TABLE "loaded_unloaded_freight_and_mail_tons_tu" (
  "year" real,
  "domestic_freight" real,
  "domestic_mail" real,
  "international_freight" real,
  "international_mail" real,
  "total_freight_and_mail" real,
  "change" text
);
SELECT COUNT("domestic_mail") FROM "loaded_unloaded_freight_and_mail_tons_tu" WHERE "total_freight_and_mail"=7853;