What was the percentage of national votes for Mahmoud Ahmadinejad?
CREATE TABLE "table1_1827900_1" (
  "candidates" text,
  "votes_khuzestan" real,
  "pct_of_votes_khuzestan" text,
  "votes_nationally" real,
  "pct_of_votes_nationally" text
);
SELECT "pct_of_votes_nationally" FROM "table1_1827900_1" WHERE "candidates"='Mahmoud Ahmadinejad';