TORONTO, Mar 18 (Reuters) - Toronto Stock Exchange S&P/TSX composite index .GSPTSE :
* Falls 59.15 points, or 0.31 percent, to 18,923.95 at open.TORONTO, Mar 18 (Reuters) - Toronto Stock Exchange S&P/TSX composite index .GSPTSE :
* Unofficially closes down 152.91 points, or 0.81 percent, at 18,830.19.