user: Question: What was deputies with the lowest number of unknown received votes, in an election year after 1986?
Columns: ['Election date', 'Party leader', 'Number of votes received', 'Percentage of votes', 'Number of deputies']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1964.0, 'Habib Bourguiba', '1,255,153', '100%', 101.0]
SQL:

assistant: SELECT "Number of deputies" FROM "Table" WHERE "Number of votes received" = 'unknown' AND "Election date" > 1986.0;