Database: debit_card_specializing
Question: What was the average monthly consumption of customers in SME for the year 2013?
SQL: SELECT AVG(T2.Consumption) / 12 FROM customers AS T1 INNER JOIN yearmonth AS T2 ON T1.CustomerID = T2.CustomerID WHERE SUBSTR(T2.Date, 1, 4) = '2013' AND T1.Segment = 'SME'