Write SQL query to solve given problem: Calculate the percentage of products supplied by Gai pturage over all products.. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT CAST(COUNT(CASE WHEN T2.CompanyName = 'Gai pturage' THEN 1 ELSE NULL END) AS REAL) * 100 / COUNT(T1.SupplierID) FROM Products AS T1 INNER JOIN Suppliers AS T2 ON T1.SupplierID = T2.SupplierID