The Bermuda Stock Exchange ended the week a fraction lower, dropping 1.99 points (0.17 percent) on its previous week close to end at 1,125.70.During last week stocks of Butterfield Bank rose one cent (0.7 percent) to close at $1.37 after 61,791 shares were traded. shares of Argus Group also improved by one cent (0.3 percent) to $3.41 after 20,000 changed hands.Shares of KeyTech lost 20 cents (3.4 percent) in value after 1,300 were traded.