You cannot save the values of the global variables from run to run.

As for looping through global variables:

Dim objPackage

Set objPackage = DTSGlobalVariables.Parent

For each objGlVar in objPackage.GlobalVariables

Set objGVProperties = objGlVar.Properties

strName = objGVProperties("Name").Value

strValue = objGVProperties("Value").Value

' your stuff can be inserted

' here

NEXT