From VGInterface Wiki
Returns a representation of your experience on a scale of 0/2000. A percentage value can be called be adding the .Percent suffix (CraftExpPctSelf.Percent).
Example
<gamevar=AdvExpPctSelf>
Results in "1000/2000"
<gamevar=AdvExpPctSelf.Percent>
Results in "50"
For readability;
<gamevar=AdvExpPctSelf> (<gamevar=AdvExpPctSelf.Percent>%)
Results in "1000/2000 (50%)"
-Derickoleary 20:17, 18 February 2007 (KRAT)