What is the percentage of total orders of Stephen Payne that had a net profit of over 1000?
Sales Team = 'Stephen Payne'; net profit can be computed as SUBTRACT(Unit Price, Unit Cost); DIVIDE(COUNT(OrderNumber where Sales Team = 'Stephen Payne' and Net Profit > 1000)), (COUNT(OrderNumber where Sales Team = 'Stephen Payne')) as percentage;
SELECT CAST(SUM(CASE WHEN REPLACE(T1.`Unit Price`, ',', '') - REPLACE(T1.`Unit Cost`, ',', '') > 1000 THEN 1 ELSE 0 END) AS REAL) * 100 / COUNT(T1.OrderNumber) FROM `Sales Orders` AS T1 INNER JOIN `Sales Team` AS T2 ON T2.SalesTeamID = T1._SalesTeamID WHERE T2.`Sales Team` = 'Stephen Payne'