shares of canadian tire corp ltd cl a ctca slipped 129 to c18177 thursday in what proved to be an allaround rough trading session for the canadian market with the sptsx composite index gsptse falling 146 to 1981069 canadian tire corp ltd cl a closed c412 short of its 52week high c18589 which the company achieved on april 25th trading volume of 235400 shares eclipsed its 50day average volume of 197106