This attribute indicates the current receive utilization during the
most recent minute, expressed as a percentage of the total
bandwidth which can be carried by this connection. This attribute is
only applicable for Vpts and not for Vpcs or Vccs.
When the Vpt is shaped, the value of this attribute is calculated
using its actual shaping rate (ASR) and should not exceed 100.
When the Vpt is unshaped, the value of this attribute is calculated
using its peak cell rate (PCR) and should not exceed 200. If the
PCR is 0, the value 255 is used.