Write SQL query to solve given problem: What is the total amount of sales made in the year 1997?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT SUM(T2.UnitPrice * T2.Quantity * (1 - T2.Discount)) FROM Orders AS T1 INNER JOIN `Order Details` AS T2 ON T1.OrderID = T2.OrderID WHERE T1.OrderDate LIKE '1997%'