delta counts by keyname

How can I get a delta count by a key name when there are multiple keys for plotting the delta in a report?

I have a collection that outputs like this via syslog:

TimeStampMsec="1390586680463" QueueName="ad.input" ConsumerCount="1" MessagePendingCount="0" EnqueueCount="9" DequeueCount="9"
TimeStampMsec="1390586680463" QueueName="ldap.input" ConsumerCount="0" MessagePendingCount="0" EnqueueCount="0" DequeueCount="0"
TimeStampMsec="1390586680463" QueueName="foo.bar" ConsumerCount="0" MessagePendingCount="4" EnqueueCount="0" DequeueCount="0"

The DequeueCount could increment for the next log entry for any of these records as identified by the QueueName key. I would like to setup a report that provides a linear graph by time for by QueueName of the delta on DequeueCount. I cannot figure this out with delta since I can't seem to get it to take the delta by the QueueName, it can only take the delta of the record previously.

I have done this with mvlist, but we could add/subtract the QueueNames and mvlist feels like it's accessing points via an array and I can't guarantee the order.