How much more will my myopia progress?

i currently have -2.5 in both eyes, and it got worse by .25 in one eye and .5 in another ever since last year and i just turend seventeen, and i had gles since age 14 though i was nearsighted by age 13, so when will my prescitption stop increasing? i grew a little this year, but didn't grow at all in the past 4 months so i think my growth is stable, so will my prescitpion still grow, also, what can you estimate my fianl presciption to be? i need expereinced experts hopefully