Database: debit_card_specializing
Question: Which year recorded the most gas use paid in EUR?
SQL: SELECT SUBSTRING(T2.Date, 1, 4) FROM customers AS T1 INNER JOIN yearmonth AS T2 ON T1.CustomerID = T2.CustomerID WHERE T1.Currency = 'EUR' GROUP BY SUBSTRING(T2.Date, 1, 4) ORDER BY SUM(T2.Consumption) DESC LIMIT 1