How many candidates had 0 percent of the vote in 1999?
CREATE TABLE "electoral_results_1990_2008" (
  "election" real,
  "candidates" real,
  "seats_won" real,
  "votes" real,
  "pct_of_vote" real
);
SELECT COUNT("candidates") FROM "electoral_results_1990_2008" WHERE "pct_of_vote"=0 AND "election"=1999 AND "seats_won">0;