user: Question: How many partners were there in 1988?
Columns: ['Outcome', 'Year', 'Location', 'Surface', 'Partner', 'Opponents', 'Score']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Winner', '1981', 'New York City', 'Carpet (I)', 'Martina Navrátilová', 'Barbara Potter Sharon Walsh', '6–0, 7–6(6)']
SQL:

assistant: SELECT COUNT("Partner") FROM "Table" WHERE "Year" = '1988';