TORONTO, Mar 18 (Reuters) - Toronto Stock Exchange S&P/TSX composite index .GSPTSE :
* Falls 487.47 points, or 3.84 percent, to 12,197.74 at open.TORONTO, Mar 18 (Reuters) - Toronto Stock Exchange S&P/TSX composite index .GSPTSE :
* Unofficially closes down 963.46 points, or 7.60 percent, at 11,721.75.