How much, in total, did client number 617 pay for all of the transactions in 1998?
SELECT SUM(T3.amount) FROM client AS T1 INNER JOIN account AS T2 ON T1.district_id = T2.district_id INNER JOIN trans AS T3 ON T2.account_id = T3.account_id WHERE STRFTIME('%Y', T3.date)= '1998' AND T1.client_id = 617