User blog:Pihou/How Many VOCALOIDs Sold?

It is something I just thought up a little while ago, but I am curious; Overall, from the  first VOCALOID series now to VOCALOID3, how many VOCALOID units have been sold overall?

I know that over 60k o f Miku have been purchased, but I wonder how many more have been bought  for all VOCALOIDs in total? Have the number o f VOCALOID units sold gone past 1 million yet? I am very curious!

It is just a thought, and I do not know how to go about  finding out how many total have been sold, un fortunately. What do you all think? How many do you think have been sold? :-)