Database: world_development_indicators
Question: What's the agregation method for the indicator whose value is 133 in 1960 for the Arab World?
SQL: SELECT T2.AggregationMethod FROM Indicators AS T1 INNER JOIN Series AS T2 ON T1.IndicatorName = T2.IndicatorName INNER JOIN Country AS T3 ON T1.CountryCode = T3.CountryCode WHERE T3.ShortName = 'Arab World' AND T1.Value = 133 AND T1.Year = 1960