The Royal Gazette / Bermuda Stock Exchange (BSX) Index remained unchanged yesterday, as only Butterfield Bank shares traded.Butterfield’s common shares closed the week on $1.55 as 62,700 shares changed hands.And 15 of the bank’s preference shares were also trade as their price stayed at $1,250.The Index closed the week on 1,233.63 points. Volume was 62,715 shares and turnover was just over $113,000.