Mine is about 6.5%, for the sole purpose that if you only play good hands or if you in other words, are a "Tight Player", you mifht have gains, but staying too much at the same table/game mode will get you tagged then your profits would end up being very minimal as people will reckon you never bluff hence they will stop following your bids.
Notice your opponents, take notes and never all-in all that much unless you are certain with a perfect calculation that you are gonna be winning.
I've lost quite a bit myself, but the good thing is that the time between refills are getting further away from each other.
Play safe, bluff wisely and the game is yours.
Post-Scriptum: Don't forget to cash out of the tables when you have a significant lead, never stay too much when for instance, the buy-in was 5$ and you cap 25 $ or even 15$, you sould take that money out and come back.
Being the chip lead can sometimes, even often, trick you into useless following of other players and before you know it you lost most of it if not all!
Enjoy the game brothers and sisters, and remember, money put in the game should never be the money from your expenses, just extra gains from overtime or things like such.