Need help with a variable issue

I have a results page that needs to display an average.  I created two variables, one for the "points total" and one for the "number of times points submitted".  I then have a trigger that divides the "points total" by "#of times submitted" when the timeline starts on the results page to calculate the "average".  My problem is that the user needs to revisit the results page multiple times, so the trigger recalculates the average again giving a smaller, inaccurate average when the user comes back a second, third time.  

I have no idea how to remedy this.  Any thoughts? 

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