The fluctuations observed during the day:

===============================================================================
                                  Current Session                     Prior Day
           Open    High     Low    Last    Time     Set   Chg     Vol       Set
===============================================================================
Mar'13   81.07    82.12   80.55   81.32    14:30   81.32   0.30  16806    81.02
                                         February 15
May'13   82.59    83.86   82.36   83.19    14:30   83.19   0.40  23999    82.79
                                         February 15
Jul'13   83.70    84.64   83.31   84.05    14:30   84.05   0.34   2082    83.71
                                         February 15
===============================================================================