If one wishes to pose a series of questions in the form of a list, how would one go about punctuating that list?

For example:

I write to a colleague asking for an update on a project he is working on. I phrase my request like so:

Dear xxx,

How are you doing with regard to:

• Sourcing the moose hair
• Reticulating the splines
• Extolling the virtues of silk underwear
• Estimating the project completion time

In this case, should question marks be placed after each bulleted item? Or should one only be placed after the last item? If this is the case, should semi colons be placed after each item?

E.g.

• Extolling the virtues of silk underwear?

• Estimating the project completion time?

or

• Extolling the virtues of silk underwear;

• Estimating the project completion time?