To do that you would need a 10 day old copy of _actOther to compare to today's copy. Then do the math to determine how many commits have occurred in the interval. Assuming, of course, that the db has been up for that entire interval and that nobody ran "proutil dbname -C zerostats".
If you mean something other than "how many commits" (maybe you would like to report the history of each commit?) then _actOther is not what you need. (For that particular purpose you would need to parse archived ai log files.)
For history of db commits you might be better off with ProTop: