[CentOS] Question about delay pools

Hi,
I configured delay pools on squid. I get the following from squidclient:

Delay pools configured: 2

Pool: 1
        Class: 1

        Aggregate:
                Disabled.

Pool: 2
        Class: 1

        Aggregate:
                Max: 187500
                Restore: 187500
                Current: -6

Memory Used: 624 bytes

End of Output

What does mean Current with a  negative value?

Thanks in advance

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