Write SQL query to solve given problem: Calculate the average runs scored during the first half of all first innings.. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT CAST(SUM(CASE WHEN 1 < Over_Id AND Over_Id < 25 THEN 1 ELSE 0 END) AS REAL) * 100 / SUM(Runs_Scored) FROM Batsman_Scored WHERE Innings_No = 1