From the other staggeringly similar thread you opened.
Try reading things.
Famine
Things that give you %:
Mission Hall - 34 races
Special Condition Hall - 63 races
Beginner Hall - 34 races
Professional Hall - 4 championships & 48 races
Extreme Hall - 4 championships & 59 races
Endurance Hall - 16 races
Japanese Hall - 3 championships & 35 races
American Hall - 1 championship & 14 races
European Hall - 7 championships & 48 races
Manufacturer Events - 14 championships & 205 races
Licences are NOT required (other than the fact that you need up to IA just to compete in some Mission Hall events which cannot be B-Specced).
8% missing is a colossal amount. It's equivalent to about 47 missing races/events. It indicates you've missed an entire Hall somewhere, or a massive slew of Manufacturer races.
Compare your garage to the Prize Car List (only the Race Events) to see what cars you haven't won.
Now do the Maths, and you'll have your answer. Do you need help with that calculator?!!!
Something you should have done before opening another pointless thread on exactly the same topic as your previous one!
Learn something quick, if you get an answer from Famine, chances are he's right. Read, learn and absorb facts from it.
Not always right, but a scary proportion of the time!