When do u think i will be able to dunk on a 10 ft rim?

I am currently around 5"5 inches tall. I am able to dunk a mini ball on a 9.5 ft rim. The rim is normally 10ft tall. I am currently an 8th grader going into my Freshmen year. when do u think i will be able to dunk a full size ball on a 10 ft rim?