user: Question: Who many dates are in position 9 and the sellout is 81%?
Columns: ['Dates (MDY)', 'Position', 'Gross sales', 'Tickets sold / available', 'Sellout (%)']
Types: ['text', 'real', 'text', 'text', 'text']
Sample row: ['05-21-08', 3.0, '$2,547,560', '16,870 / 16,870', '100%']
SQL:

assistant: SELECT COUNT("Dates (MDY)") FROM "Table" WHERE "Position" = 9.0 AND "Sellout (%)" = '81%';