RE: Final Table %

This is my first post so go easy people....its not one of those tell me how great i am im getting 50% ITM posts....all i'm wondering is what sort of pertantage of final tables i should be aiming at in MTT's....obviously it depends on amount of players and $ buy-in as regard skill level.... but say every thing is below $10 buying with around 300-500 players....if anyone can help it would be great.....

cheers