Write SQL query to solve given problem: What is the percentage difference between month 0 absence and month 9 absence?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT CAST(((SUM(IIF(month = 0, 1, 0)) - SUM(IIF(month = 9, 1, 0)))) AS REAL) * 100 / SUM(IIF(month = 0, 1, 0)) FROM longest_absense_from_school