Write SQL query to solve given problem: Calculate the percentage salary of employees who handled orders shipped in 1996.. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT CAST(SUM(CASE WHEN STRFTIME('%Y', T2.ShippedDate) = '1996' THEN T1.Salary ELSE 0 END) AS REAL) * 100 / SUM(T1.Salary) FROM Employees AS T1 INNER JOIN Orders AS T2 ON T1.EmployeeID = T2.EmployeeID