problem with awstats

[Jiele <zjl@jiele.net>]

Hi, guys,
    Installed Awstats (Version: 5.6-1), works fine. However, I just 
noticed that it only generates monthly report. So when a new month 
starts, all the past statistics are gone, and everything starts from 0 
(e.g. number of visits, domains/countries, etc).
    One possible way is to generate a new report when a new month 
starts, but what I want is to see all the historical data from a single 
report.
    Is there a way to config awstats so that it accumulate everything 
in a single report, instead of starting new report each month? I checked 
its docs, but no joy.
    Thanks!