Description: This table contains specific performance statistics collected
by each entity over the specified interval.

The table has the maximum of 96 buckets for all the supported
intervals. The following table would list the total hours of
history maintained for various intervals. 

Intervals (minutes)  Buckets        History
=========            =======        =======
15                    96            24 hours
5                     96             8 hours
1                     96             1 hour 36 minutes

An agent creates a conceptual row to this table corresponding
to a physical entity upon detection of a physical entity
supporting the specific performance statistics for a specific
interval.

An agent destroys a conceptual row from this table
corresponding to a physical entity upon removal of
the physical entity.

The support for 15-minutes interval history is required for
all the entities supporting performance data. However, the
support for 1-minute and 5-minutes interval history for 
entities are optional and at the descretion of the device
supporting the performance monitoring.