wordpress stats, how to migrate old count?

I just installed wordpress stats and it said I could move the stats for my old .com blog to my new .org one which is what I wanted to do. I was then just given one button to click, something along the lines of ‘yes add my blog’ which I did. However although the stats are working, they are reset to zero and instead I have to use a drop down menu on the screen to select my old .com blog to see the stats from that.

So my questions, how can move the stats (visitors to date etc) from my .com over to my .org blog?

Many thanks (I did a search but mainly just found lots of people saying the stats don’t work full stop)