CREATE TABLE table_51971 ("Election" FLOAT, "candidates" FLOAT, "seats won" FLOAT, "votes" FLOAT, "% of vote" FLOAT)

How many candidates had 0 percent of the vote in 1999?
SELECT COUNT("candidates") FROM table_51971 WHERE "% of vote" = '0' AND "Election" = '1999' AND "seats won" > '0'
SELECT COUNT("candidates") FROM "table_51971" WHERE "% of vote" = '0' AND "Election" = '1999' AND "seats won" > '0'