Get back a variable on the front-office...

[vincent29]

Hello
Sorry I do not speak English...
virtuemart 2.0.2 / joomla 2.5.8

My wish please:
Get back a variable on the front-office: The total of the number of sold products (id 1) over all the period.
ID1 is a membership to an association, the members wish to see the number on the site.
Thank you very much for your help, cordially
Vincent