user: Question: What is the capacity percentage when the total attendance is 509940?
Columns: ['Team', 'Stadium', 'Home Games', 'Average Attendance', 'Total Attendance', 'Capacity Percentage']
Types: ['text', 'text', 'real', 'real', 'real', 'text']
Sample row: ['Dallas Cowboys', 'Cowboys Stadium', 8.0, 85512.0, 684096.0, '106.9%']
SQL:

assistant: SELECT "Capacity Percentage" FROM "Table" WHERE "Total Attendance" = 509940.0;