State% scorm moodle

Good morning! I´m having problems with the information of my scorm. My scorms correctly notify the start and end of the course marking it as completed; if a student leaves in the middle of the course, scorm remembers perfectly where he was going. My problem is that I want to mark in the moodle the% of progress it takes; that is to say if it left in the middle that some parameter marks 50% of the course.

I work with scorm 1.2

Thank you!