Question: Of the matches that were won by runs by team 1, what percentage have team 1 won the toss and decided to field?
SQL: SELECT CAST(COUNT(CASE WHEN T1.Team_1 = T1.Match_Winner = T1.Toss_Winner THEN 1 ELSE 0 END) AS REAL) * 100 / TOTAL(T1.Team_1) FROM `Match` AS T1 INNER JOIN Win_By AS T2 ON T1.Win_Type = T2.Win_Id INNER JOIN Toss_Decision AS T3 ON T1.Toss_Decide = T3.Toss_Id WHERE T3.Toss_Name = 'field' AND T2.Win_Type = 'runs'