Standard deviation of daily per cent changes in the CAD-USD exchange rate since the CAD was allowed to float in June, 1970: 0.33.
Number of days in which daily per cent changes exceeded six standard deviations since June 1970: 6.
Number of days in which daily per cent changes exceeded six standard deviations since September 15, 2008 (the day Lehman Brothers filed for bankruptcy): 5.
Worthwhile Canadian Initiative 