user: Question: Name the total number of rank for percentage change yoy 13.1%
Columns: ['State Rank', 'National Rank', 'Institution', 'Location', 'Public or Private', 'Endowment Funds', 'Percentage Change YOY']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 129.0, 'Furman University', 'Greenville, South Carolina', 'Private', '$498,282,000', '12.2%']
SQL:

assistant: SELECT COUNT("National Rank") FROM "Table" WHERE "Percentage Change YOY" = '13.1%';