Had Bitcoin's price increased or decreased on 2013/5/5 compared with the price 7 days before?
price increased refers to percent_change_7d>0; decreased refers percent_change_7d<0; on 2013/5/5 refers to date = '2013-05-05'
SELECT (CASE WHEN T2.percent_change_7d > 0 THEN 'INCREASED' ELSE 'DECREASED' END) FROM coins AS T1 INNER JOIN historical AS T2 ON T1.id = T2.coin_id WHERE T2.date = '2013-05-05' AND T1.name = 'Bitcoin'