The (high 32 bits) value of
wfFrSwCctLocalSentDEOctets value
at wfFrSwUsageEndTimeStamp.
Note: Since wfFrSwCctLocalSentDEOctets
is a 32-bit COUNTER, this is really a counter
keeping track of number of times
wfFrSwCctLocalSentDEOctets has wrapped around.