The fluctuations observed during the day:

==================================================================================
                                   Current Session                       Prior Day
           Open    High     Low    Last     Time      Set     Chg      Vol     Set
==================================================================================
Mar'13   75.60   76.28    75.29   76.18    14:30    76.18      0.35  10544   75.83
                                          December 21
May'13   76.25   76.92    75.95   76.76    14:30    76.76      0.28   1412   76.48
                                          December 21
Jul'13   76.67   77.40    76.67   77.31    14:30    77.31      0.27   1608   77.04
                                          December 21
==================================================================================