Butterfield Bank soared 5.5 percent in Bermuda Stock Exchange (BSX) trading in the week it announced its first annual profit in three years.Butterfield ended the week six cents higher at $1.16, on the trading of 6.513 shares, after it posted 2011 net income of $40.5 million on Wednesday.The value of Butterfield’s preference shares also rose by $5, or 0.4 percent, to close on $1,235.The one domestic-board stock to decline last week was insurer Argus Group Holdings Ltd, which slipped five cents, or 1.2 percent, to $4.10, as 11,500 shares were traded.Ascendant Group Ltd, KeyTech Ltd and Bermuda Aviation Services Ltd all saw shares change hands but their share prices remained unchanged.Butterfield’s rise propelled The Royal Gazette / BSX Index to a rise of 27.53 points, or 2.63 percent, to end the week on 1,043.9.Volume was 32,863 shares and turnover topped $282,000.