user: Question: How many candidates had 0 percent of the vote in 1999?
Columns: ['Election', 'candidates', 'seats won', 'votes', '% of vote']
Types: ['real', 'real', 'real', 'real', 'real']
Sample row: [1990.0, 9.0, 0.0, 210.0, 0.01]
SQL:

assistant: SELECT COUNT("candidates") FROM "Table" WHERE "% of vote" = 0.0 AND "Election" = 1999.0 AND "seats won" > 0.0;