The data would be in rrd files used to create the graphs and XI will display the values over a given a period of time but not a total average.
The rrd files are in /usr/local/nagios/share/perfdata/<hostname>/<servicedesc>.rrd if you're inclined to spend some time with rrdtool - rrdtool dump <filename> will dump the contents of the database for example.
Average Port / Interface Bandwidth
Re: Average Port / Interface Bandwidth
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Re: Average Port / Interface Bandwidth
Not natively, but the graph data could be exported as csv through the web UI and then parsed in excel.
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