By default statistics produce counter, for example cumulative,
values. You can change this with StatsType parameter. The parameter value
is the output type and can be one of:

: cumulative counter shows the number of processed packets.*cumulative*: derivative is the difference (delta) between two counter values in time interval.`derivative`: packet rate is the amount of packets transferred within time interval (packets per second).*packet_rate*: all produces output from all available statistic types (cumulative, derivative and packet_rate).*all*

The default output type is cumulative.

# We are interested in the difference (delta) StatsType derivative